So now this idea is actually a project and never remained to be an idea.
So what happened to Shattered Stars? Is that ever gonna be finished? its well over 1 GB, and the game got lots of hate, cuz:
1) There were so many "updates" which could be done by just creating a changelog flie and could be uploaded OR could have 1 post right after the campaign details to keep the changelogs and the forums tidy
2) There was no solid gameplay, and most of the sarcasm that you have received, you take it as a compliment, and in-turn, when you do it that way, the mod is worse and ppl troll you more
3) Your obsession about the mortal engines idea is not really possible. If you were doing the same with FS2 timeline, yes, create a new timeline which is imaginary, yes. BUT trying to make a mortal engine continuity is just a mega project, i dont think a single person will buy it with your "many barks but no bite" type of untested releases.
4) If you perfect something small, think about all the possible ideas and views about how people may respond. Rather than trying to justify each action of yours will brew more hate and more opinions of you as a joke.
IF you are gonna look inwards, change and tell that "Yes, i need to somewhat listen to what people say, with an open mind," you can possibly make a really good campaigns
Your ideas are cool, but you need to properly convey them in the form of missions/campaigns.
I'm just saying this as a friend and i hope that you do not take it in the wrong way.
EDIT 1: And yes, PhysX is mostly for games that require a quick calculation for small objects like long hair in a breeze, and stuffs using like glass breaking and the shards scattering on floor, etc.
There is no requirement to implement the PhysX stuffs into FS engine. So please stopped being obsessed about the stuffs. The core FSO guys are gonna think and implement that