Forum for users that want to write their own custom queries against the PT database either via the Structured Query Language (SQL) or using the PT3 custom stats/reports interface.
Possibly not, but again it's an easy one to build. There is a limp/fold stat that I built on page 3 of the Repository which you should be able to Duplicate and adapt pretty easily.
I'm not sure how it's done in PT2, but it will certainly be 'behind the scenes' - you could ask Pat in the PT2 forum but you will still then have to work out which PT3 database fields it relates to. It should be pretty easy to build as a Custom Stat based on what has already been done..