It would be really useful to be able to call a confirmation dialogue action from a microflow and then have a boolean return with the user's response, which can then be acted upon. Currently it seems that you need to build a custom dialogue page each time it's needed in an app, or pass an object through a single confirmation page and then build some sort of handler which could easily become a monster in any medium to large project.
Just in case somebody else is as confused about this as I was. The Show confirmation action is part of the Nanoflow Commons from the App store.
Cool! Thanks for the update, Bart!
It's not mentioned in the release notes as far as I can see, but this feature (the confirmation at least) has been added to nanoflows in Mx 8 beta :)