The new shot pattern options are awesome!
In my opinion the research costs should be something between 2500 and 5000. More seems to be unbalanced, for example if you compare it with the Nuclear tech (1000) or Orbital Ion Cannons mod techs (4000). And with space sience packs it should take a while until you can replace the regular remote.
If you want to increase costs I would look for a way doing this on the shots like eradicator suggests.
However I don't know if it's even necessary - for me cleaning up biter bases in the end-game phase has just become an annoying, repetitive task, I'm glad the smart remote works like it does.
Maybe the shot targets can only be placed where you have line of sight, that would make it a little less spammable.