So, all of us have been clamoring about an sandbox mode for years and still have yet to see anything besides these new challenges.
A simple solution does exist however. Each day, we have our galactic war. Most of us sim it to get rewards. Others play for fun or to test squads. There are already 12 squads there that we have fought or simmed against.
Why not make it where we can continually battle these squads for no rewards. They don’t have to worry about creating a screen where you select the toons you want to fight. They can literally just put the button back where you fought the squad.
We get to fight more squads without an energy crunch and they don’t have to completely create a new game mode or anything. We all win.