Food for thought. Maybe I’m misreading, but it looks as though when LT/RT is pressed together, it causes Guide/Home to be pressed. Say a specific game with an unintuitive button config mode comes along where for a specific move, you have to press LT & RT is pressed simultaneously. Instead of getting said move, you get the guide to pop up. Or you go to PS3 Home. Or (If for some reason, this game is on PS2/Gamecube) Nothing happens. Or, if you meant Start/Select together when switched over, in a haze of confusion, you hit that thinking it’s LT/RT. You get guide. Or in another haze of confusion, you hit what you think is LT, and pause the game. Or RT and nothing happens, or it takes you to main menu.
Now put this series of hypothetical circumstances into a tournament scenario.
IMO this is really impractical, and could cause nothing good to come about for a vast majority of people.
I honestly feel like placing buttons on the side or on the back near the USB cable doesn’t imply the degree of inconvenience you insinuate it does. First thing, it doesn’t take long to get used to the placement if you play with that stick enough. Secondly, they are placed there with a reason: to prevent accidental button presses that could pause the game.