This is a totally awesome Mod and I got it merged with the existing mods without too much trouble, which is just as well cause I have no idea of PHP or MySQL.
I did have one suggestion, and due to the above I won't be attempting it myself. In the edit customer page where you can switch the RA off, could an automated email button be added. Ie. Application refused/ Application Accepted. To notify the customer that they can/can't purchase at discounted rates.
Congrats to all involved.