All I really need to be able to do is clear the screen or move the cursor to the beginning of a line so that continuously updating results can be put on one line instead of continual new lines causing the window to scroll crazily.
I've missed this ever since I started using the Arduino IDE. A small effort here (even just proper CR/LF handling) would help a lot.
Integration with an external serial monitor may be the way to go, but tight integration is better than even a large feature set. That is I would not like to loose automatic close on build.