Allowed Alphauserpoints (Minus points to user)

Hello, I run into a lot of problems with Alphauserpoints and now I need it to accept that user can have "minus points" to there account. An example... User "Jack" Have 10 points in hes account.. each month Jack have to pay a fee for a product he use. Admin depute from back end 20 points from Jack's account but system message is "AUP_YOUDONOTHAVEENOUGHPOINTSTOPERFORMTHISOPERATION" So I want basically the alphauserpoints to accepts that when an admin from back end set a new custom point for a user it accept that the points can be minus. And then when a user "Jack" buy points from the shop the system recalculate the user "Jack" points account! An example: User "Jack" 10 points (Current) User "Jack" -20 points (admin depute minus -20 points from account) User "Jack" -10 points (Jack new totally points) User "Jack" 20 points (Jack buy 20 points from shop) User "Jack" 10 points (Jack new totally points) I hope this makes since. I am sure its just a php coding that needs to be done but I have worked for the last 2 hours to make it to work but with no success.