No way to drop automatic story arc

[srmalloy]

There are contacts that you talk to -- Agent Watkins in NW Steel Canyon is one example -- who lock you into their story arc the moment you first talk to them, without ever getting a mission from them. There needs to be a way to drop an arc if you have no missions or progress in that arc; otherwise, you can get part of your story arc space tied up with arcs you have/had no intention of doing.