1)You can not run different offsets on an AWD vehicle, correct? Eg./38 ET in the front 33 ET in the back.
Yes, you can. Not recommend tho.
3)Do you need extended lugs or different lugnuts when using spacers?
If you get 10 mm spacers, you need to swap the studs. If you get 15mm, then you can go with wheel adaptors/spacers.