Tasting food, items, etc.: yes! Anything they eat or consume in Fragment will taste as it does in reality and leave them feeling satiated as well. This applies to alcohol as well. Go on, get plastered. Who's gonna know?

Adept Rogues: yes, absolutely! We've gone a little free form with party configurations, so you're free to take liberties with these things. The only thing that would hold Justy back from living his best off-tank life is his own skill as a gamer. Your logic checks out, here's our official Stamp Of Approval©