Feature Request: Add/Subtract as an alternative to updating total

Is there a way I can add an extra way of adding points. Maybe you could add it in the settings. So instead of “updating” 300 points to 350 points, the admin would just enter 50 points, and the total would add 50 points to the prior number of points for that user. If the admin wanted to subtract 25 points, they would simply enter -25.

Also, I just wanted to make sure points could go into the negative. If I subtract 50 points from a user with 25 points, I want their new total to -25 points.

Thanks!

http://wordpress.org/plugins/cubepoints/