In my folder list, folder shortcuts only seem to work for some of the folders. No idea why it works only for certain folder, reminds me of bug 233391, in which showing the startup folder works only for some folders.
Could be a model problem (missing rowsInserted signal?), so adding Steve to CC list.
Shortcuts works here for all my folders, both in Local Folders and in various Imap resources. Closing for now, please re-open if reproducible still.