Hi,
As we often create multiple Proposals to communicate a complex construction or time sequence, it seems logical to add the ability to transition between them during an animation sequence. That way could shown the changes taking place during an animation e.g. using an orbit or camera path animation preset and seeing the site change.
It could for example be added to the existing Transition drop down along with Cut, Face from Black and Fade from white. Alternatively, you could add the option to define the proposal for each storyboard and then transition between them on an additional timeline. Essentially a 'Proposal Storyboard' allowing you to add your storyboards and fade or cut between them.
Cheers,
Steve