I dont share your fear for compiled scripts: just as people shouldn't load up unknown exe files the same would apply to a compiled script. Alot of security features could be build into the compiler such as only allowing file handling (deleting/modifying) on files in $scriptdir and subfolders, no external file loading etc etc but even so a C++ build exe file could be just as malicious as a compiled mIRC Script.

Now that's all im going to say as creating a mIRC Script compiler is a massive task on its own and i wonder if someone can even bother.