Our app avoids placing an icon in the task bar (window.SKIP_TASKBAR), so windows should get out of the way and let us live in the tray (aka notification area). But no, nanny-microsoft decides they know best, so we would need some code to go and hack the registry (yuk), something like what is mentioned in ​this thread.

We workaround the latest gnome "upgrade" by forcing gtk to display icons where we expect them to be (IMO looks ugly without), we may want to give the user the option to enable it or not instead.

We can shadow local displays like we do with NX/VNC displays.
The difficulty is in figuring out if that's really a wise thing to do... At least make it global option, preferably let the local user of that display decide (assuming he is running the client...)
We may also want to allow this local display to be exported to via a remote server, which complicates things quite a bit... (reverse SSH tunnel to that server - then another tunnel to the client...)