Well, I may get inspired to change how the Maquis work in the DS9 scenario as per a discussion earlier this year, but as of right now no new releases are planned unless something comes up.
It's possible to change the animations, but I wouldn't know how (I'm good on the coding front but not the art front); I'm not sure if anyone involved with the mod knows how. I remember that I was delighted that the units could get animations at all (they originally didn't have any).