This may not sound terribly useful, but there are some bits of maps you can clamber over, and it can also help in the middle of a fight - not to mention all the fun you can have jumping away from explosions to help yourself fly. Right, now - many games give you a selection of weapons to choose from, and TFC is among these. By default the weapons are on the number keys 1-5 and thats just fine. They are also accessible by rolling the mouse wheel. And thats good too.
Lets keep going.
Oh, two you WILL need. Thats already WAY too many keys. Forget the rest. Leave them at defaults. Right, the last non-techie thing you need to set up is your name.