I find myself using the same numeric values over and over, but needing to change the sign of the value. In many cases I have to do this over and over, changing the sign one way and then back again. This is especially true when drawing squares or cubes around a center point using the "Point Relative" command.
It would be nice to have a "Change Sign" function that would simply change the sign of a selected value with the press of a single key.
Note: I am thinking of a global function that will work with every command that has numerical input fields.