Dunno if he can add Vine to that Insert Video tag button as I think it's some crappy 3rd party plugin that supposedly likes to break the rest of the forum. \o/
I'd create a separate custom BB Code tag for Vine (and YouTube, for that matter, so proper HTML5 playback can be supported):
[CODE]<iframe src="https://vine.co/v/{param}/embed/simple" width="600" height="600" frameborder="0"></iframe><script src="https://platform.vine.co/static/scripts/embed.js"></script>[/CODE]
You could then use it by specifying the Video ID in the Vine tag. Something like:
[vine]Ml16lZVTTxe[/vine]
...to embed a video, such as
https://vine.co/v/Ml16lZVTTxe
Users would have to be smart enough not to try to fit the whole URL instead of just the ID into the tag, though. xd
Where's the $$$$$$? :0