Ok now first off am not suggesting that STO can run on a mobile as it is (because I am pretty sure it cant) nor am I suggesting an app for doffing etc.
However I do think that a cut down version of the engine could fill a gap in the mobile market and be quite a nice little earner for PWE
I do not know how feasible this would be in terms of running it on android/ios but when you have things such as fortnight and PUBG and the upcoming Elder Scrolls Blades, it does look possible.
As it stands there are some Star Trek mobile games but tbh I have struggled to enjoy them (Timelines was a convoluted mess with poor space combat and a mental grind with really confusing systems, Trexels 1 and 2 were ok and the combat has improved but it is not as good as it could be, the new card game one looks good but really not suited to trek).
What I propose is a hugely cut down version of the engine and set way before STO during the conflict in the Demilitarised zone between the Marquis and the Cardassian equivalent.
First off the playable ships would be no bigger than a maquis raider and there is an opportunity to introduce new designs for various smaller craft from freighters to small patrol ships. NPCs representing the Federation and Cardassians could have larger ships to represent the patrol ships on their respective sides of the zone. There should be a good degree of customisation for these ships to represent the varied marquis/cardassian crews.
Combat would be a mixture of pvp/pve (but possibly not forced pvp) with the factions raiding convoys and each others ships/bases. I am not sure if it should be just space combat or space and ground because I don't know how demanding that would be even with a cut down system. Certainly if it were possible it would be great to actually board freighters or bases and transporter tag stuff. The ships would have more weapon slots than a usual small craft representing the ingenuity of the factions and the fact they don't always follow regulations.
Crews would be the captain and up to 3 "crew" (Boffs basically) as there would not be the need to have a huge number of boffs (especially if there isn't any combat). I would also tone down the more graphically intensive Boff powers and maybe have some more era appropriate ones. I think even as basic graphics sto can still be pretty good.
Map wise it would be a tiny fraction of the current sto map zoomed in to cover just the demilitarised zone and a small strip of federation and cardassian space either side. The Badlands would feature also as it is a major maquis area. I would maybe have DS9 and/or Bajor but they aren't essential.
Plot wise you could certainly have fun with the pve side and I think a group of maquis raiders trying to take down a galor class could be quite fun if balanced properly.
You could even maybe have a facility to copy a character from STO to the mobile game or vice versa (Although that would be a little hard to explain given the time jump).
I think if it can be done there is a lot of potential for challenging missions like raiding bases, breaking people out of prison.
PWE could make money out of lockboxes as they do in STO as well as in app purchases (Although I would make them strongboxes and make you raid heavily guarded convoys so its like a heist)