Increment ranges while mouse held down.
It would be great for all of the arrows on ranges in the property inspector to increment rapidly if the mouse click is held down for more than a certain threshold (half second?).
Two other related suggestions that may make sense: allow mouse wheel scroll to increment/decrement a range, and/or the up/down arrows to do the same when a range is selected.
Having to mouse click for every increment is sometimes a little tedious.