I loved creating missions in X-Wing back in the day. It wasn't too hard to balance it there, because you didn't have to worry about it being fair to the computer...
But would there be interest in a series of missions that was based more on a narrative, but part of that meant that one side would be weaker. Clearly this wouldn't be done for competitive gaming, it would be more akin to a Role-playing game, with the "game master" running the Imp's or Reb's, knowing full well the deck is stacked against them, but wanting give the best fight they can.
If there was a demand for such a thing, perhaps a branching campaign, that's something I'd consider doing and publishing. But if no one would like it, then I don't think I'd bother.