Thanks for commenting!
There are no plans to add traditional dice combat to Stand Up. The belonging outside belonging system and Stand up don't use dice at all, so everything is resolved through roleplay and collaborative storytelling.
However, that doesn't mean you can't be in combat! I tried to make your Mask Moves, the things you can use in the Reversal (the "metaverse"), empowering in situations where you feel like fighting is the answer.
You can play the game without getting into a fight at all or get into lots of fights, in and out of the the Reversal. It all depends on what you and your group feels right for your story. Fundamentally, though, adding a combat system is antithetical to the core system of the game, so it will never be added.
As for the GM-less aspect, I'm currently working on an update that will give new players to GM-less tabletop games some more help starting out, especially if you're used to games like D&D. I'm not sure when it will come out, but keep an eye out if that's something you think would help you play.
I hope this answered your question in a helpful way!