My sophomore year in high school, I got my first computer to call my own. If was payed for by my father, and it was in my room. (At the same time, my brother also got a computer...he is two years older.) It was the dell specced in my sig, and it had Norton Internet parental controls and web filters. I also did not have administrative accounts.
After about 14 months, my dad decided that I have never given him a reason to not trust me. He gave me admin rights, and from then on I have always been in control of the computer. Two months ago I even took off his admin account because he hadn't used it since the day he changed my account, and he could not remember his password.
The MBP specced in my sig was purchased by my dad for me last Tuesday. It is going to be my college laptop, and my dad was actually ready to buy it several months ago. I was the one waiting for the updates. When we got home, I plugged it in, and ran the setup. I offered to give him his own user account but he said it was not needed and he has not even used the computer yet.
The point I am trying to make is that maybe with some time and patience your father may decide that it is reasonable to remove parental controls. I am a senior now, and my dad asks me for advice before he makes any change or purchase even remotely related to electronics. He has come a long way since he gave me admin rights, and I think that your dad will come to his senses too.
PS. Because of almost everything listed above, when I talked to my dad about buying a MBP for college, he loved the idea and research I did so much that his next computer will either me a iMac or a 17"MBP.
Now, sorry I can't help with your actual problem...
