Bux Mods

I have a bux site from yourownbux. I need two modifications, neither should be that hard. First, The smallest advertising package is 500 hits and I need one added for 100 hits. Must be user friendly in the admin section as all other hit choices. Second, I need a premium member only function. When a premium member uses their referal link I need their name where it can not be erased in the signup field. I want this for preimum members only, free members I want the field left just like it is. Any questions about my needs, please send me a pm and I will try to make my needs clear