Would it be possible to add "save" and "cancel" buttons to the import filter manager? When doing a lot of testing, it would save having to close and reopen the manager repeatedly.
You don't need to save and reopen the import filter manager. Just click on another filter (in the left pane) and Bookends will display it (and ask you if you wanted to save any changes you made, if any, in the filter you are looking at).