OK, so this was not apparent to me and Tony as we played, but the way you select Multiplayer Options, is to use the F10 Settings and Select Options
There you can turn ON/OFF the types of Game Types, Terrorist Hunt, Hostage Rescue, etc and then below that Turn On/Off Maps you want to play.
So you could turn on Terrorist Hunt only, and then Hereford Map only, and run that over and over...