1/2 button for numerical inputs

It would be helpful to have a button that split the stack in half in any of the various numerical inputs (use some, transfer some, take credits, give credits, toss some). Using the button twice would cause the amount to be transferred to be 1/4 of the max value, three times would bring it to 1/8th, etc. This would be helpful when, for example, tossing fuel/missiles to bots, trying to split the proceeds of an instance run, and in a variety of other circumstances.