Is there any mod that adds new feats to the game? Or is this hardcoded? I was specially interested on Weapon Finesse.

We can add new feats to the game, but they won't do anything, the functions of feats are hard coded. The best you can do is make a feat kind of like the Affect/Dominate Mind force powers. These powers don't do anything on their own, but are used in conditional scripts to check if the player has them.

PCGM is back up, by the way. If it goes down guys, don't worry about it, Sergio just puts a lot of work into it. So, don't panic if it doesn't load, it just means Sergio's doing something good. :)