Well most resolution options are available from the command line, but since this is not hildonized fullscreen requires hard kill of xterm which may leave open sound device.

Probably best to run windowed until bindings allow clean exit of program but if you dont mind maybe having to reboot, you can run :

./sdlquake -winsize 800 480 -fullscreen

You've got alot more experience doing linux builds so if you'd like to take over or help out please do!