Well, not to get in the eternal argument of "if the US Navy of TODAY (circa 2011) does not have Commodores, then why would a FICTIONAL Starfleet set in 2409 have them?" Basing rank off Starfleet should have NO bearing on what our Navy currently has. Besides, Commodore was used thru-out ENT and TOS. Who is to say they didn't reactivate the rank/title during the time of war. If anything, it would make MORE sense to re-issue that rank/title in 2409 due to the constant war going on. RA's simply do not command starships and go on scan 5 things missions, it is just too below them. (Not saying Commodores should do them either, but at least it has been shown Commodores still command starships.) If anything, allow us to play our First Officer when you reach RA and above.