I think Taurus recommends against using +P in their guns, I'd guess the main reason is because of the lifetime warranty; it's true that hot ammo will beat up (any) gun faster which would mean Taurus would have to replace/repair it for free.
I wouldn't use +P all the time but I doubt you'll have problems with occasional use.
Some use of +P would be okay in the PT92C. As a steady diet excessive wear and tear on parts would take place and is not needed. Not to mention +P ammo practice is pricey and hard on the pocket book.
Chuck Karwan ,Chuck Taylor, and Mas Ayoob have had PT92s come through there courses on a regular basis. These guns have kept running all the way through the 500 rounds or more for each of their courses when expensive high brand pistols have choked or broken. PT92s are also loaner guns at these schools in case one's own gun breaks so the student can finish the course.
Here are some links on the ammo question. I have a PT111 Mil/pro that see's regular diet of standard pressure rounds. A magazine or two of +P for practice to stay current with it and occasionally have +P loads in it for as the house gun. For the most part standard pressure loads are used.Even for self defense. Reasoning is in the links.