This is quickly becoming an unintentional “game controller Saturday”. We haven’t been covering the PSP much lately, so this is a treat. AcidMods forum member [Electro] put together a quick guide for adding two missing shoulder buttons to the PSP. The L2 and R2 buttons are used while playing Playstation 1 games and are usually mapped to directions on the joystick. This mod jumps the joystick’s contacts an relocates the buttons to the shoulders. The switches used in the post seem kind of bulky, but you’re free to use anything that fits.