No it shouldn't. The performance gain will be minimal.
Probably 50/50 would be best, so you don't pass out while driving, but still get a whiff of the fart.
Depends what you feed it. If you've been feeding it protein drinks you'll have a protein filled fart.
No not necessarily. The types that do that are generally skanks. Depends who you want to attract. They may feel more relaxed and fart in your presence too.
If you've got power windows, there's usually a lock button to disengage the passenger windows. Simply lock them and have your window wound up, and release the fart. For best results 100% plumback in to the cabin, just be careful you don't passout yourself.
Hope that helps man.