Add-on Display an indicator for Threads where Staff has posted

I am interested in something that will allow me to do this:

Whenever a member that is part of a specific user group, such as Staff has posted in a thread;
- add some indicator that shows forum members that the thread has been responded to by a member of Staff

And in addition;
Allow a live "tracker" on the right side navigation bar that shows the latest threads where staff has responded

Does something similar to this already exist?