Re: Which filter/action hook should I use?
1. insert “quote” button on every post like my “report” button
2. don’t use javascript, use the arg add function and build a simple url for each quote button which references the source post id #
3. clicking said url button does a get from the server/bbpress
4. look for and capture the $_GET (ie. "epost=1327)
5. now the hard part, tell bbpress to start a new reply post in the topic and insert the formatted text from the quoted post. I have no clue how to pass bbpress existing text to a new post. Not even sure it has the action/filter to do it. I would bet not 
