Eh... I dont know if anybody knows this, but I checked out Tremulous' data, and it looks compatible with Quake 3... (PK3-files)
And what I know is this: Debian is binary-compatible with Maemo. You can run apps made for Debian Lenny on Maemo as long as the depencies are correct. However, the biggest problem with Tremulous is that it's made for OpenGL found in SDL, not GLES. They aren't compatible, and that's where the problem appears.

Note: Im not a developer. I'm just a guy who knows his way around Linux and it's ways.

Ok: i dare to make this statement: Tremulous-maps and all data is in theory compatible with Quake 3 and Open Arena.

And, no, i dont want any bounty...