That's perhaps only scratching the surface. Imagine the room creator sees someone they want to kick for whatever reason, and that player is removed from the room, mid-fight. That would make someone think they are death-evading. Additionally, if people are dedicated enough they can 'team' to get kicked before they die for death evasion or team to target a person they dislike.
All in all, I only see problems with this suggestion. Giving this power is too much. Room Creator should be able to just run /kick like everyone else.
I've also seen interpretations of "my room, my rules" to mean 'oh? it's my room. I can macro all I want'.