Hmmm. All of these don't really match with WP's tag functionality, except for the stylesheet feature (actually, would a font name work for you too, as colors and size can already be controlled? Flash's CSS support is a little flaky).
WP-Cumulus is merely a frontend for WordPress' own tagging system, so there's no data for the tooltips, no icons associated with tags, and every tag does link to somewhere.
It wouldn't be too hard to modify the Flash movie to be able to do all these things, but WP-Cumulus would never use them because it gets its data from WP. I'm currently working on a Flash 10 version of the movie, and need to focus on features that benefit WP-Cumulus.