it can help covering maps quicker, less recoil on weapons.better jumping.few other points.
tripe, resolution and detail do nothing to recoil, its tied into in game callibration tied to the engine and the way it is made, if you could stop recoil or lesson it it would be classed as cheating, as the hacks that stop recoil do.
As for jumping, it might be better because of your perseption of the world you are in at a res of 800x600 but that is purely down to your preferance of res and not the FPS it is running at.
i found controling recoil hard when i moved to 1680x1050 because of the added accuracy needed, it has nothing to do with my FPS and after a day or 2 adjustmant took place and its no differant now!