[ravenfish]

My instinct on the "what to do with Constriction Attack" question is to have it allow you to grapple with your body as well as a normal person could with two hands (albeit possibly with only a limited subset of targets and techniques), so a snake with it can wrap and strangle while having No Fine Manipulators, and a lamia with it can wrap and strangle while either keeping arms free for other work or grappling with them as well for the "extra arms" bonus.