Yeah I would imagine his ESP's have a very low action but remember he only uses 10's or something (correct me if I'm wrong) and at the tuning he uses, they will be quite loose so vibrato and bends will be fairly easy.
Yeah, 10s down a whole step (D standard)...I'd assume he has his action set as low as possible to be able to do all that tapping and legato with as little force required from his fingers as possible.