I trained and flight instructed on the PA44-180T, however it was about three years ago. The turbo does have a pop-off in case you do go over your maximum Man. Press., which I think is about 39"-40". Thats about the only protection/control of the turbo system. You really have to monitor your MP when adding power because you only use 1/2 to 3/4 of the throttle travel, it can be really deceiving. The turbo-lag can also be a little deceiving. As far as temps go, you might have to use your cowl flaps more often, but descending in the turbo Seminole is not that hard on engine temps. When I was instructing the rule was to keep the engines at 1000 rpm for 5 mins. before you shut down the engines due to temps etc....

Have a great flight!