For ITZ you could stack up like 40 cones high in your robot (without a mogo), place it all on mobile goal, and then just hold the top cone at the end of the match. The top cone wouldn’t count, but the other 39 would, and you might get the highest stack bonus with that
And for NBN, you could put up a big wall in front of your opponent’s goal to stop them from scoring.
My robot jumps so that it is level with the high flag and then shoots the ball at it. This is very smart because all of the balls velocity is aimed directly at the flag and the force is used in the most efficient way. It also never exceeds 18" in height.
For ITZ the coolest thing for me would have been a robot that inserted cones at the bottom of the stack. Lift whatever was there, insert a cone, replace the above stack. It could stack arbitrarily tall without ever needing to expand.
Way back in the day of Gateway, there was a robot with a boom arm that covered the center goal and uncovered it only to let their alliance score, but it was actually legal (and very cool). Vex has added a few rules that might prevent something like that now though