if modeled correctly, those planes with that limitation,, such as the 51 or the 38 would have engine failure after the 10 seconds, that might be a neat thing but it also has a problem in that you cannot feel the g force or lack there of
the problem is not with inverted flight but with zero or negative sustained g, playing a computer game and in combat it would be hard to look at the g- force indicator and fight constantly. the way we fight now would be changed a great deal if that were to be in that positive g would have to be pulled almost all the time ! engine management would play a large factor that at this time we do not have to worry about.
"I would be all for trying it this way", but I am fine with it the way it is now as well,, and would not want to overburden players with to much to think about if it took away from the combat!
I do imagine tho,, that many here would love it, I also think HTC probably thought about all of this!