I was recently part of a Governance meeting, where a Proposer brought up a slideshow to support his Proposal. He did so in the 'Present Proposal' round.
People instantly started to frown because they were afraid it would take a lot of time, but technically I didn't see reason to object to this: the constitution does not prescribe any format for presenting a proposal.
I'm wondering if anyone has experienced similar 'presentations'. The challenge is that such presentations may diverge considerably, whereas discussing the proposal in GlassFrog keeps it quite focussed. Wonder how you dealt with this!