I dont know if you knew this, but parties are different from my experience anyway. You can be in dion and someone else in giran, if you type /invite AAAA he will still get the party invitation. I dont think theres a range for that.
I never had trouble targetting NPCs with spaces in their names. But to make sure, I just logged in to test.
I typed /target priest of dawn and voila, I had him on target :cool:
perhaps in some previous chronicle it was like that?