This has been discussed before. Not only would there simply be enough time to keep up with two versions of mIRC (i.e. decide what should be cut out, deal with bugs that occur because things cut out, would cutting out X feature affect Y feature etc.) but also a feature would be removed and then another person who makes a bot would say "I didn't want that feature removed, I use it for my bot." etc.
Personally I see way too many difficulties caused by releasing gimmick versions of mIRC. You might try using the
Search feature for threads that relate to creating "preliminary" versions of mIRC, and the reasons put forward by the majority as to why there shouldn't be any. Expand to 'All Forums' (Although you could probably leave it on 'Feature Suggestions') and expand to 'All Posts' for best results.
My 2 cents

Regards,