tl;dr, and I cant speak craprish, I'm not ronery enough.
To OP:both DFP and momo are equally crap(menaning: crappy wheels, but the best in the price range). try both, see what you like more, compare current price at your local store(s), decide. whatever you buy is a good choice.
Icontweaker or Iconpackager....Icontweaker is free, and doesn't cause problems. (Iconpackager has a nasty habit of overwriting a system file, not sure if they fixed it, and its not free.)
Well, nobody is stopping you to code an application that connects through insim and sends clutch and engine status, and to create somekind of a smell dispenser that is basically bunch of small bottles containing smelly liquids, some electronics and that connects to LFS through that app, and every time someting happens, i.e. you break a clutch, it activates the correct mixture for that particular smell etc.