You may have not noticed it, but I try to keep the Freeware Garden as varied as possible. No, really, and the fact that I haven't mentioned any multiplayer FPS games yet has been completely coincidental and not at all the result of my being hysterically bored of anything even vaguely resembling Quake.Besides, here's the lovely, lovely S.W.A.P.. The S.W.A.P. is very much an FPS,…