Well I would like to see things like switch and for, however like you said these are "minor" things. Scripters would upgrade to get such features, however if the mIRC versions.txt for the next version read:
1. Added for loops
2. Added switch statements

And that was it, the majority of non-scripting users wouldn't bother upgrading. Also seeing as how such things are probably easy the implement, it means Khaled most likely won't spend much time on them therefore freeing his time to work on more in depth ideas and there are a few complex suggestions which could occupy him for a while.