Flow buttons are a good way to kick something off IF you live in a mobile device. If your day is spent inside of a PC then this is less than convinient.
How about plugins for Outlook that provide flow buttons for the desktop. This would also be relevant to teams as people are now starting to spend more time logged into this too.
i.e. Give computer users an equivalent ability.
This would potentially allow automation of email processing as well as other stuff. Could quite happily replace the Outlook rules engine over time especially if a button could be created that sent the current message ID etc.