Ditto to what Motorhead said - I do the same thing (except mine does spend most of it's time in the safe and not by the back door). Mag in place with first round fired, fully gassed, and ready to go - usually also with a pass of my boresnake before loading that mag and firing off that first shot
.
I keep it fully charged and ready to go, and with my current tune that means 3100 psi, constantly at that pressure except for when I'm actively shooting it. I would only consider "storing it" at 2000 psi or so if I were truly putting it into storage - planning to leave it alone for six months or more (it would also be fully wiped down with a good coat of Balistol then too). Other than that, it stays fully charged all the time, and I expect no troubles from doing so - there have been none to date on my 2009 gun, and for much of 2011 is was running (and stored) on a 3200 psi tune . . . .