ready to dismiss my post because mIRC wasn't made for math purposes?
Basically: yes. If you start implementing everything into mIRC it would become like Windows - so many features that the basic features are becoming unimportant.
This problem shouldn't be fixed because my usage of mIRC is deemed improper by you?
Not deemed improper by me -- mIRC is a chatting program, not a calculator. Your suggestions is at all unrelated to the concept of chatting. And while as suggested people like to do other things while chatting, I simply run another program at the same time and run it in the background.