One of the things I thought that would be cool to add is a card called something like "Unexpected Ally" where perhaps its a reward that allows you to create a side deck of 2-6 hero skirmish cards (that arent the heroes being used in the campaign) and one is randomly drawn and thats the ally you bring to that mission and the Imperial Player only gets like 4 threat. So you can bring in a Biv/Gaarkhan/Fenn for super cheap. And if you have Murins exp card, basically for free. But its random.
~D
I think that's a super cool idea. Figure out the average heros' skirmish cost, maybe add one, and you commit to paying before seeing which one... (No Jyn we don't want your help. Go home!)