I think a script interpriter that reads mIRC script is a great idea. I myself can actually use one for all the useless programs I make. It is much easier for me to just script it oposed to using VB or C++ to make it.
The only problem is: it is a great idea, but Khaled has staed numerous times that he wont release the source, or make another "version" of mIRC. So don't count on one ever being made.