howdy.. 
I would like to have the apps that I've pinned to my taskbar show up on all taskbars (3 monitors), while still keeping the "running app" version nof the button on only the window where my app is open.
I imagine this working as a combination of the "Show taskbar buttons on" options for "All taskbars" and "Taskbar where window is open", in the sense that:
- when an app is pinned, the app's taskbar button should show on all taskbars
- when an app is launched, the app's taskbar button should only expand on the monitor where it is open
at the moment, I'm running Start11 with the "Taskbar where window is open" option, just to keep things looking cleaner.. but having the ability to quickly access any of my pinned apps from any of the taskbars spanning my 5760px wide desktop would be, well, just downright awesome.
hopefully this isn't a monstrous task.. but the biggest question: is this a viable idea? on the surface it seems pretty simple, but I'm not aware of the underlying mechanics that make all of this possible.