while the other groups of researchers in this area (mathematicians, computer scientists, economists, etc) talk to one another (at least a little), the philosophers are mostly isolated.

A more relevant question is whether mathematicians, CS folks and economists would talk to one another about foundational issues in decision theory. It appears that this subtopic has mostly been classified under academic philosophy, which explains why other DT researchers would pay little attention to Newcomb's problem. (It's true that other DT researchers have considered the related problem of making credible precommitments, and this literature should probably be cited in any introduction to UDT/TDT.) A good review of the one journal paper would suffice to raise interest among folks dealing with the more applied kind of DT.