Saw this earlier and while this tactic is not currently modeled (as far as I know) in DCS I can see how it could partially be replicated with a trigger in the sim. The video shows how a SA-6 operator in Bosnia shot down an F-16C back in the 90s (Scott O'grady's bird). The SA-6 operator (according to the video) acquired the F-16s speed, altitude, and heading with a short burst of radar usage then turned off and then waited till the F-16s were closer then launched his missiles and waited till they were closer to the F-16s to paint them for a hit. Food for thought if anyone wanted to create or ask for smarter SAMs.
http://www.youtube.com/watch?feature=player_embedded&v=znBi8Lr35vs