Yeah I set it up high/gated low/not gated for a number of reasons, it is good for when other people drive it (eg the Girlfriend), low with no gate is easier to control in motorkhana type events, low with no gate is safer in the wet etc etc. It basically gives the car two totally different engine and driving characteristics at the flick of a switch.
My car is pretty light and has a very light rear end, so it breaks traction very easily (which can be good and bad )
I can't see any problem with getting the car tuned pre Hiperboost, one of the tuners who frequents these forums or even the guy who makes them may offer some better info on this topic than I can though.