Hi Ruby,
Unfortunately what you’re describing won’t be feasible with PCIbex, or you’d need to code so many extra layers that it doesn’t really make sense to use PCIbex as a starting point.
PCIbex is ill-suited for any sort of multi-player study at the moment. Judging from a quick look around, it looks like there are some resources: Empirica, oTree, nodeGame, TurkServer, and there might be more. I have never designed an online synchronuous experiment, and am not familiar with those tools, so I can’t speak to how user-friendly they are.
Jeremy