An icon showing video and/or storyboard would be nice somewhere in the section above, on the forum. This is an extra icon that may promote more storyboard modding, as well as video offset checks.
They could name it in the title. You can always edit that. The beatmapper could also request it if he's aware of any video/SB problem.
There are already too many icons in the beatmap forum. Star/heart icons and the number telling you how many stars it's got. but I can see the appeal in modding video offset and SBs.