Hi, I've been trying this out and the mission editor interested me greatly. There's just one thing that would allow a lot of more open-ended scenarios:
Branching conversations that trigger events. I know this is probably already in the roadmap, but this would open up the possibilities of storytelling greatly. For instance, you could either spare or destroy an enemy mech, or even convince one over to your side after sufficient damage.
Personally, I'm excited and greatly intrigued with the development of this game.