Pelya's Android port already applied various tweaks to thirdperson view. Maybe
digging into it/asking to him may help?
However, I'm doubtful about improving thirdperson mode in baseoa for PC. I
guessed the lack of crosshair in thirperson mode was purposely done by id software di discourage third-person usage. Q3A is a
first-person-shooter (back to its golden days, it was
THE fist person shooter -okay, also Unreal Tournament was a cool game, true-), and also most of its mod
(with a few excecptions like Bid for Power, BombQ3, Q3 Plaftorm, Target Quake 3) primarily focused on firstperson.
Thirperson allows to see more what's happening around you, hence thirdperson gives an advantage over firstperson.
What Pelya tells us with his thirdperson mode is that he frags more with it than with firstperson mode. While this is acceptable between Android users (which play with touchscreen, which is less comfortable), and even if these Android users do fight against PC users, I can guess Android users are still disadvantaged due to their input method (PC users use firstperson, but
play with accurate keyboard and mouse controls).
Note: I haven't tried yet to connect to PC servers from my Android phone.I fear I did not write a straight sentence, however to sum up: I fear that making a better thirperson mode for PC may give thirperson users an advantage over firstperson users. And considering this game was born as a firstperson game, this may be a problem.