As one of Vuo's developers, I work on Vuo's engine (the thing that makes compositions run), work on nodes, and write documentation. You'll see me on the forums answering people's questions about Vuo.
I've been developing apps and frameworks for several years (since I was in college). Pre-Vuo projects include Kineme Quartz Composer plugins, iOS apps for education, an app that analyzes photographs of tomato slices, and software to help people with disabilities use talking keyboards.
I enjoy using Vuo to make live music visuals. My hope for Vuo is that it will grow into a community of people of diverse backgrounds and identities making lots of different artistic, useful, unique, goofy, beautiful, crafty, wonderful compositions.
First answer — Yes, as you figured out, @Alastair, Re-Fire Event fires an event through the trigger port or input port that most recently had an event manually fired. (This is mentioned in the manual under Firing an event manually.)
I have not tested this at all, but maybe you could record a series of 1-frame movies each with a different bitrate (use the Finalize port to end one movie and start the next) and then assemble them back into one movie using a composition like the attached.