The main problem with that is we would probably have to build two transmissions, one for each side. We don’t really have any room left in the middle for a gearbox (or anything really). Our robot was originally intended to focus on full-court shooting, but we found that with the Banshee drive we can play the field as well.
The main thing I was commenting on was you saying
There is a way to do it. I’ve looked at the green eggs design from toss up, and they were so close to making a complete PTO rather than coupling something to the drivetrain, while still fitting larger game objects. I’m not saying it’s going to be an easy change, but maybe if time isn’t a problem and you’re looking forward to the challenge of a redesign, you’ll make something even more amazing 
EDIT:
But I should correct myself. You will have to remove a motor from something else, which you are correct. But as I intended, you can still achieve the same capabilities as before in addition to the transmission.
Even if you’re able to completely keep the opposing midfield robot from scoring (which would only be necessary if their mid field bot scores more than your’s), the only time this grants you the win is if your full court robot is better than your opponents’. How often will that be the case? Relying on a certain scenario like that is silly.
Yes, but you can choose this in alliances. While a 12 motor turbo tank drive would, imo, be an awful first pick, they could certainly be an excellent second pick for an alliance with an excellent full court shooter.
Our robot shoots full court just fine; it’s just that in that case it made sense. and it worked well. Will we always do that? definitely not. but if our alliance has another shooter that shoots full court consistently, and quickly, why wouldn’t we try to prevent the opposing team from scoring?
I’m not saying that using that strategy is silly when all the planets align, in fact using that strategy makes the most sense in that case. However, the chance of that specific scenario occurring is so low that I would advise against designing your robot around that single unlikely scenario.
We don’t design it specifically around that scenario. Two members of our team had used it in FRC and it worked really well, so we decided to try it on our robot.
I went through calculations for an X-drive early in the season. I don’t remember off the top of my head but I believe that the holonomic drive only has 67.7% (something like that) of the power that a tank drive has. So ultimately, a tank drive is more efficient, but the sideways drive could be worth it.
In doing so it may add speed (indirectly). If, for example, the robot is heavy and motors are struggling, the addition of extra motors will make it move faster.
You are correct in saying this, but the result is usually minimal, unless you almost stall the motors you have on it now. The main advantage of adding more motors to a drive is the increased power. This comes as torque because motors have a limit on how fast they can spin, but you can convert that torque to speed with a gear ratio. If you are building a defensive robot, you want a powerful drive, with lots of torque to win pushing battles. You also need enough speed to get near your opponents before they score, so you can’t really use a low gear ratio, like 1:3. That would win just about every pushing battle with 4 motors, but you would move at about 33 rpm (on 4" wheels, less than 7 inches per second) with torque motors, or about 53 rpm (11.1 inches per second) with speed motors. To increase the torque of the drive without reducing speed, you need more power. Let’s try an 8 motor drive, now. You have double the torque available of the typical drive, with 4 motors, but you didn’t halve your speed. To increase speed further, you can try a 5:3 gear ratio on speed motors, which is what most drives use. This reduces your torque available to the equivalent of 4.8 speed motors, which is still more than most drives, but now your speed has increased from 160 rpm (34 inches per second) to 267.2 rpm (56 inches per second).
For this year I made our robot be both an offensive and defensive robot, but only defensive to other defensive robots (if that makes since). Our chassis is made up of 4 highspeed motors directly spinning the 4 inch omni wheels, with a pnumatic brake on ether side. Due to the speed motors we can move around the field and score balls quickly thus offensive, but when a defensive robot is trying to push us or block us we still have the torque to push back and the brakes to lock us in place. The brakes work insainly well because we can push our way through robots and when they start pushing back we activate the brakes and let the other team burn out there motors trying to push us.
We decided to stick with speed gears instead of turbo because it gave us more torque to push other robots when necissary. Due to the brake system we really dont have to worry about any other robots messing our shots up, plus its pretty cool to make all your shots while someone is raming into you. So far we have not seen one robot that can move us when our brakes are activated, in fact we had a team member try to push our bot and he ended up moving the field befor he moved the bot. Over all I would have to say if you can’t have both (transmission) then stick with speed and some sort of defensive mechanism. In the future we will probably switch over to turbo drive so we can keep up with all the other insainly fast teams.
We have a four motor drive geared 1:1 and have never lost a pushing battle as far as I can remember.
Are you able to push other robots without stalling your drive? We rarely lose pushing battles with our 4 speed motor drive, but they generally end with a stalemate, rather than pushing the other robot. That post was me trying to say that a 6 motor drive is most useful on defensive robots, which don’t need as many motors for the launcher or intake since scoring is not their primary strategy, and that those 2 motors are usually better used somewhere else on an offensive robot.
if we stalled our drive, we would not actually be pushing anything
Why did you build your robot with a slow/strong drive if it wasn’t to play defense? My previously stated scenario is the only time playing defense against a midfield robot is helpful. Also, if you didn’t design your robot around that scenario, why would you use your robot as an example and suggest that other’s do so for that reason?
when did i suggest that others do so for that reason?