Need more shortcuts for the desktop apps

The app experience could be considerably improved by adding shortcuts to the following categories of tasks: navigation, annotation.

Things I can think of right now in each category:

Navigation:

• Move between tabs using standard Mac key-bindings for tab shifting
• Move between tabs using Cmd+tab_number. 
• Go to the main view using Cmd+1 (which is tab number 1) like in legacy Papers app
• Bind Cmd+E to edit metadata for a paper like in legacy Papers app
• Add key bindings for various kinds of "copy-as" 
• Add shortcuts to bring up and dismiss the menu in reading mode and facility to navigate through the menu items using tab or some other key combination