Thank you for your comments - As the one who put this specific instance together, I really do appreciate your constructive feedback.
I admit it was risky for me to forcibly push non-instance-owners to the sideline like this, and it didn't really work out as well on live as it did in testing :\ As such, I'm currently trying out a few things to make it less of an annoyance for non-instance-owners, while still maintaining the singular-focus this particular instance requires - I can't promise any of it will work out and make it into a patch, but I feel it's important for you to know I'm able to realise when I have a little egg on my face, and that I'm willing to work with the community to make changes that improve gameplay.
Again, thanks very much for the constructive feedback, /u/Atena_Kemet :)