Edit: this is actually how you do it, you go to the steam\steamapps\common\dota 2 beta\dota\cfg folder and make a file in notepad, add the line
dota_minimap_misclick_time "0.4"(or whatever amount of time works for you), and save it as autoexec.cfg
I also have
dota_disable_range_finder "0" dota_force_right_click_attack 1enabled. These commands respectively show a range indicator when you cast a spell and let you deny by rightclicking.
Edited by Tensei, 09 November 2012 - 04:48 PM.