I'm Unity Mail developer and I wonder if it's possible to add a shortcut to Messaging Menu from within the application (it's written in Python).
I need to connect it's
user-display to a function in the application. For example, this is needed for "Mark all as read" command.
The specification only says about static shortcuts, which are added to .desktop file:
.desktopfile itself, an application may specify shortcut actions that can be invoked regardless of whether the program is running. The syntax of these actions is defined in ApplicationShortcuts.