What does that mean?
Draft/preview
I used it all the time. But if it's something not generally used, then it's probably not worth the trouble.
I saw that was not in V3 but in 4 years and managing hundreds of groups I have never used or needed it as if I proof read it later I could always go in and edit the mistakes. If I was just doing drafts I would use Wordpad and save it for later to copy and paste into a forum comment. I truly didn't know of any of my friends or admins that had ever done more then just try the preview option. IMO from my experience
I have an impression that, unlike V2, V3 does not timeout when a comment is being composed. To confirm, an experiment: i started typing this on Sunday, 11:10 PM PST, and intend to post it once I wake up on Monday.
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Are there any plans to allow one to save a draft (preview) of a forum comment?