This idea has already been suggested numerous times. The best thing to do would be to use the search feature.
To sum it up a bit for you the largest concern would be that most of the script language would be out of place. For example what would On TEXT do in an application?
I think as far as speed wise it might be a nice idea but to completly remove mIRC from its language would have less affect than any of the others.
Also note that while mIRC's scripting language is very fun and easy to learn/use it is also very limited compared to other languages such as C and the likes. So applications created with the script language would pail in comparison to those created with a more advanced/powerfull one.