I think this was available at some point but was removed (not 100% sure this was the case).
Basically I would like to be able to pause/unpause the syncing from the tray icon in Linux, instead of having to launch the Insync window to do it.
I use Insync to sync my Calibre library and it is vital that the syncing is paused while Calibre is working and books are added / removed / edited, etc to avoid corruption of the database or other inconvenient stuff.