I made a plugin for rFactor that users of Fanatec's wheels might be interested in. Vanilla rFactor doesn't allow gears to be missed even if the rev-matching is terrible and you aren't using the clutch. My plugin monitors how you change gear and if you don't match the revs well enough (or use the clutch) then you'll hear a grinding sound and the gearbox will be stuck in neural for a little while.
The install is relatively simple, but you do need to follow the instructions ;). It will work with any mod, but for some you have to do a bit more work to get it to work properly (there is a troubleshooting guide supplied).
The idea of the plugin was to bring a more realistic gear shifting experience to rFactor, and to punish lazy shifts (and it will give you a real reason to use that clutch pedal you paid for!).
If this kind of thing interests you, then you can get the plugin here: