So this is a bug or a new feature ?Some recent-ish SRB2 patch made thrusting prevent you from changing direction in analogue mode.
Note the direction change during the dash at the beginning of this gif. I couldn't have done that in the current SRB2 version, I'd have been forced to keep going directly forward. (Ignore that it's topdown, the analogue change applies to it too.)
Offtopic:
Can you please answer my question in your amy/rosy release ?