You really and truley believe Khaled hasn't made this addition because he feels there's not enough interest? I'm sure there are other reasons other than the (lack there of) signatures pleading for him to make said feature.

There are several ways around this, including using IDE to reload a script that's been modified outside of mIRC. If you're still having that much trouble with syntax, maybe it's time to read the manual over or start looking up when you type? Further more, if you're looking to do something that complex, maybe move on to a DLL and then you'll have the IDE and your pretty colors.