The point is having to add a toggle for a feature because it doesn't work correctly under an EMU? This wouldn't happen if Wine were emulating the Windows API correctly, hence it's a Wine problem not a mIRC problem.
the line numbers should have a on/off switch somewhere, i personally dont care for the line numbers.. in any editor.
I can respect wanting a switch because you don't like the line numbers, but not the other reason at all. I personally like having it there because it's nice to have as a reference when scrolling vertically. It made life just a little bit easier.