[Refplace]

I like Bills idea and always thought Amber made a good Dreamworld. To address some of your over concerns say everyone is out of phase with each other. Mental shield is the skill to use to keep people out. Use a techniques to bring people in and make them part of your dreamscape. That lets people travel togetherwhile Lucid dreaming lets you phase into and travel to other regions. Perhaps use Jumper and Warp modifiers