Allow Office Add-ins to be persistent - to stay open as you move from document to document...
A productivity taskpane/add-in, by definition, is a often a tool a user would use on every document.
The current implementation requires a user go to the add-in Ribbon, click a button etc.
Ideally a user setting would allow an Add-in to stay open all the time.
Prashant Mhase commented
I also need this feature. Keep taskpane open all the time.