Why not a desktop app version done with Node Webkit ?

Could use some settings from a local file, like for example the last window status as next default at start. Maybe some themes to select from.

Room sharing could use the same method; adding the URL directly to the clipboard or into an input with "select all" on click.

The main problem could be the app size.

For the distribution compilation; Web2Executable works for me. Can be found on github.