I believe the sixth toe can prevent you from getting a Vault City Citizenship (through legalities, doing work or buying a fake would still work), however the doc outside of Vault City will remove it for you. Other than that, Radiation just takes off little bits of HP at a time.
Re: Sulik.....Sulik can only use Submachineguns. Not all small guns, just guns like the H&K's, Grease Gun, etc. However he's much better in melee IMO. For more info on NPC's and their skills, check out
No Mutants Allowed.
To move an NPC out of the way (in Fallout 2) right click on the NPC and hold until the menu pops out. I can't remember which option you select that moves them, but there's one where the NPC moves out of the way. IIRC the icon had an arrow, but maybe not.