Add-on Thread Creator limiting new replies/guest viewing per thread

[Live Free]

I'm looking for a few add-ons.

• The thread creator can allow or disallow new posts (himself excluded) in "their thread" within specific forums
• The thread creator can choose the thread viewing permissions, making it viewable publicly/to guests, or only to members, on a per-thread basis within specific forums

Do such add-ons already exist?

If anyone's interested in developing these, PM me.