Just finished reading through the entire discussion. I too am hoping for a dynamic multiplayer implementation through construct 2, and it is essential for the project I've put together.
So while photon cloud appears to be far off, I am curious whether or not a Gaikai plug-in could be made possible. They are a relatively new company that may very well take a liking to the C2 community and development potential.
In their FAQ, it reads:
"Where do I download Gaikai from?
That's the best part: you don't. There's no special Gaikai program to download then install. Playing a game on Gaikai is as easy as watching a video on YouTube. How? We chose to support web technologies, like Flash, Java, Silverlight, HTML5, etc."
"Does Gaikai support expansions? Mods? Controllers?
Yes, yes, and yes. Many of our demos currently offer gamepad support. It's easy for us to offer games with all expansion packs pre-installed. There's no need for the players to install anything themselves.
We offer full support of PC controllers (joypads, joysticks, steering wheels, guitars etc.) If you are a controller manufacturer and want to be Gaikai certified, please feel free to email us for more information using our Contact Page."
Apologies if this suggestion is completely unfeasible for reasons outside of my knowledge.
Regardless, if there is any help that I can offer regarding C2 multiplayer functionality, I would be glad to do what I can.