That is no so easy like seems to be.. Because mIRC accept changing settings only from his Option Window.. Even if you delete the reg-key.. mIRC will no refresh his config from Registry.. The mIRC keep the settings in the memory.. He load the config only at load.. After.. When you open the Option Window.. mIRC load the config from his memory nor from $mircini/registry.. IF you change some think.. It save to .ini/registry.. But no any load..
I discover that when i trying to do a alias(/Highlight) what enable/disable Highlight..
sorry form my bad english ;] 
