So, there is no way to disable this in the console or the .ini files? Evertime I go to Solitude I get to be attacked by an annoying argonian? [censored] this svcks.
I think there is a console command, setessential, that may change a character to either essential or unessential when used. I might be wrong though.
Edit: Found the TESCS wiki page for it, http://cs.elderscrolls.com/index.php/SetEssential, hopefully it still works.
Also, it may be possible to use StopCombat (http://cs.elderscrolls.com/index.php/StopCombat) to get him to leave you alone.