Well why were Feats created? In new school gaming the idea was to provide a way to do cool things.
Like tripping someone.
But why do you need a Feat to do things?
In a game with Gamemaster Fiat things such as a bullrush, trip, sundering of a weapon were done on the fly by adding a few points of difficulty to the too hit number or subtracting from the player's roll.
Wow in this short article I just provided you with an unlimited source and list of feats.