The problem:
If you have a large list of items in the global variable list and you want to add a new variable, you have to scroll all the way down to the bottom of the list to click on a line of white space to add a new variable.
Possible solution:
Dock the empty line to the variable editor section. Click on this line to clear the populated variable fields and add a new variable.
Another request:
If this is something that gets added, I'd also like to request the same thing for the variable & events tab in the FSM editor.