Cannot delete Number in "+ #" box

I do like the arrow feature added to D20, however if you do add too many numbers there is no way to retract or delete the value and you choices are ether click down until you get the number you want(which is a nightmare if you 50+) or type a letter in the field and 'X' out of the application to reset the field. Could you add a way to delete the value more easily? Thanks ^^

This is also a problem with character sheet number fields. You could just double click the value and set it to 0 to reset it, you don't have to type a letter.