Sometimes i wish the forum had spoiler tags so that i could do some image dumps without creating a massive page stretch. Also, instead of snipping, you can quote someones large post and spoiler it so that people can see it right there.
And of course use it for spoilers.
also smf may not support spoiler boxes that can collapse
SMF does, its just a mod. steves old forum used to have it and so do other forums i've been on that uses smf also.