3D Master
Rear Admiral
No - the Phasers were ONLY cut off because the Warp Engines were in 'anti-matter' imbalance; because the new phaser design channeled phaser power through the warp engines. The fact they were at FTL speed or sublight speed made no difference. The 'no phasers at warp' was something stated in one of the TNG era TV series.
Nope. At best it was in a Technical Manual, but I'm not even sure that's true.
Anyway, one thing Voyager got right: in Non Sequitur a Nebula-class fires a phaser at warp at the experimental shuttle that Paris and Garrett Wang are in. (For some reason the Ensign's name refused to come up.)