This is an amazing guide, and I have borrowed a lot of the tips and tricks!
I wonder if anyone has any tips to solve a couple issues I am having - specifically with the Ally and Destroy Object tasks.
In parts of my stories, I want to have an Ally or Object guarded by just 1 boss. The only option I see is the enemy group selection, so I create a custom group with just my boss in it - however, depending on how many players are in the mission, it will frequently have the boss and clones of the boss. From the difficulty slider Easy/Medium/Hard/Single - Single always seems (at least when I test solo) to leave the Ally/Object just standing there alone with no enemies in sight... I tried adding a minion to the custom group as well, but for solo players, I then get only a minion or two guarding the Ally/Object and no boss...