You don't need to nerf the game for MP. That's a pretty hard lived myth. Look at games like Civilization 5 and Europa Universalis. No need to change the MP game.
Its not a myth in case of individually controlled battles involving 2 players taking alternative moves that to have mass appeal a game needs to different. A multiplayer TBS game in which completly alternate moves take place one after another is possible (though still few will play civ on marathon), but one with individual battle control needs to reduce number of turns to make up for the time used to fight the battles.
Take AOW, in that game for multiplayer simultaneous move feature is normally switched on and normally auto resolve in battle vs AI and monsters is used, because otherwise the game takes too long. There are even people playing AOW as PBEM meaning tactical battle control is gone.
FE is slower game than AOW, does not include simultaneous moves, does not include any multiplayer function, has a suboptimal autoresolve battles (poor dark wizards), so a lot of things would have to be done to make it so multiplayer friendly that somebody beyond a small group uses it. And that i suspect is the basic consideration for Stardock to include features, so how many customers would value such a feature vs the effort needed. In that respect multiplayer probably ranks rather low, hence its a feature they will not include soon.
Of course, Stardock might say otherwise, but thats my guess how they would evaluate it. Obviously, just having multiplayer without any adjustment would be preferable over not having it.