Using FCK Editor for "Drafts" in SMF?

Good Morning,
I run a successful forum which is based on SMF. My members have been asking me if there is a way to implement a "draft" feature that would allow them to save posts they are working on as they develop them to a final state.

I love the way FCK Editor works. I'm wondering, is there some way I could install this in SMF and have it function as a "drafts" feature?

Any help would be greatly appreciated!

Thanks,
Matthew