Pressure Plate Bolts?
#2
I'm not an expert this is just my opinion. but the only problem I see with it is you might get a vibration since it's not in balance anymore. I don't know if it'll be enough to cause a problem short term, it might wear out your clutches faster though.
#3
His "clutches" wouldn't wear out faster, but he might have a vibration and possibly wear out the Input Shaft Bearing and/or pilot bearing.
If it is your DD then you can probably get by with just throwing it back in, but if you have time to let it sit and work on it, I would get it balanced.
If it is your DD then you can probably get by with just throwing it back in, but if you have time to let it sit and work on it, I would get it balanced.