But if you know how to implement this, you are welcome to do so yourself.
I am good at C++, but not familiarize with the GUI stuff. The use of qt4 will make these thing easier.
So i don't really understand what was the point of forcing everybody to pay the miners additional fees if it wasn't necessary.
Mining cartel of whatever ?
Probably the reason is that there is also some non standard miners program. You change your own client does not affect the other client. It is always up to the miner to decide whether they want to include your transaction or not. The release notes
http://forum.bitcoin.org/index.php?topic=16553.0 say that the official "miner" will accept as low as 0.0001 BTC, it is 5 times lower than the value set by normal interface. So you might consider to set it as your transaction fee so that other miner will relay your transaction. You know, most of the client out there are using officail one.
Have you ever take a look of the part of the miner code? I guess they have codes to require fee for frequency transaction.