As far as bugs go, there's not really too much to report.
The Homies still show up in groups without the "Optional Homies" Mod.
And having Kazuo as both a Specialist and a regular gang member seems to break Heli Assault and Guardian Angel. Because it's spawning the Specialist version as the enemy vehicle driver. So the vehicles just stop, and Kazuo gets out of the vehicles and starts zooming around uncontrollably.
Having just Jyunichi as the Specialist seemed to work fine, and it seems weird watching an old man zoom around like The Flash anyway.
It would be nice if you could resize Maero in the Cutscenes like you did with the Gang Customization & Wrestling Match variants of him, unless that's not possible. I just thought it was funny seeing Tiny Maero in the Cutscenes because it mocked how bad his model is in SRIV, but if you can resize him to better fit the Cutscenes, then that's great.