Alright,
First off, I'll give you a hand in reflashing the car. I'm going to try to get down that weekend.
Second of all, as far as overboosting, this can happen, but it will not happen nearly as bad as the 2.5L motor. You have a 2.0 (unless you've made a swap) and that should not overboost like the 2.5L motor.
But, there is a way to get around this problem if you have to wait for a tune. The solution is to unplug the Boost Control Solenoid (not the tubes going to it, but the actually wires that go to it). Why is this a feasible solution you may ask? Well, unplugging this takes away its power to operate so you will be running on the wastegate spring which opens at 7psi. Even if you overboost slightly you'll only be seeing a few lbs over that. The power will suck, but it keeps it safe.
Also, XPT makes some great maps for those that don't want to spend the money on an access port or something like that. Also, anyone that needs a hand to just throw one on, let me know.