Since some time I'm using Subtitle edit. The author, Nikolaj Lynge Olsson, has a very decent help file on his site. Despite that, people of course still have questions (I just mailed him one).
You can email him, he'll answer sooner or later (I don't know how fast, usually), and I have also seen the occasional answer from him on miscellaneous forums.

I'm thinking of suggesting him to take his support to SU.
That way he would only have to check one site for questions, other people can contribute as well, and the answers benefit more people at once.

• Is this OK here? (I don't see anything in help or meta against it, and there are many program-specific tags already)
  
• Are there any special requirements?

And we would need a tag, of course (subtitle-edit?)