Edit Text Mode in main windows instead of popup

Description - It would be much nicer the Edit Text Mode button enabled editing in the main windows instead of having to put it in the tiny popup window that appears.

Why is this feature important to you - The edit popup is so small you can't really use it. You have to do your editing in an external editor and past it into the popup

How would you like the feature to work - upon clicking "Edit Text Mode" the main window where you can see the code should be enabled for editing.