Given how chasing retreating squads is generally better than staying stationary (chasing gives more DPS in total), I doubt Tactical Assault/Advance (which is basically equal to staying stationary) on retreat is that much better than just chasing without it.
Bodyblocking
OKW:
Stuka zu Fuß:
Unit should have 2 volley options:
- classic line volley
- random scatter volley
HELL NO
Dodging rocket artillery has to be done instantly and relies on sound queues. The only mobile arty with 2 modes is the Katyusha, which either hits one spot or one spot after another, so it's similar enough that you always dodge the same way and the alt firing mode is a skillshot basically with risk/reward. Giving the stuka saturation or a straight line would make it much harder to dodge preemptively.