Thanks for the feedback! Here's what I have so far:
- Brace/Compensation Cockpit grants the mentioned movement and quick action regardless of the source of the Stunned condition, so long as you are not the source of it. You still auto-fail saves and are unable to take reactions. If this turns out to be busted after targeted playtesting, we'll make the necessary changes.
- That's a funny one! The intended effect is for the burn and heat to only effect characters hostile to the user of Hundred Devils, but we will definitely see about clarifying the wording.