Accept this trade; Octavio Dotel & Beltre for Shields?

I wouldn't do it, Shields is an incredibly underrated pitcher. Your starting pitching isn't exactly perfect, so I'd definitely want to keep Shields. You're right in that you could use the RP help, but Dotel isn't exactly a great option anyways. Closers come and go (soon enough there will be a new closer for the Dbacks/Brewers who you can pick up), but it's tough to find a consistent/solid pitcher like Shields. Besides, you have no use for Beltre. A-Rod is a top tier player at 3B, and the guys you can use at utility right now are perfectly fine. I'd rather trade guys like Romero, Penny, or Niemann for some help at RP, I'd wait until one of them has a superb outing or goes on a hot streak, then sell high.