Make it easier to assign link sets
At present the only way to assign books to link sets is to manually click each one and choose the link set. I would like really anything that is more efficient than this.
Examples of ways this could be done better:
Have a keyboard shortcut to assign a link set eg. Ctrl+Alt+A/B/C/D/E/F
Have a right-click menu from the link set letters to assign linkset: to This book, Books in this panel, All open books
Hold a modifier key when choosing a link set to assign all open resources with the same index type to chosen link set.
Hold a modifier key when opening any book to add it to the link set of the currently selected resource.
Another way would be to make the panels work like tabs in Excel by holding Ctrl while clicking on each panel you want to link together.