Answered: Clarification of <RCS3>

See :

Does any point include the fractions of second after the match start? For example, would it be legal if you were to legally load your one preload, holding the remaining 3 stars right above your robot, and drop them as soon as the match began?

Additionally, it is legal for Drive Team Members to break the plane of the field perimeter when they deploy Driver Control Loads?

Yes, this is both a legal and common strategy.

Yes, this is allowed as per <G7a>, which is quoted below. (Some text bolded for emphasis.)