this has long been my only little frustration with mIRC. Can't count the amount of times I have mentioned it while being on mIRC!
But drag and drop channel tabs ! I often sometimes leave one channel then when I re join, the new window is the last tab opened. Leaving me making the mistake of typing in the wrong channels a few times ^_^
I know it's only a tiny little thing but it would be nice for us organised lot to be able to rearrange the order of the tabs when needed !