They are able to be targeted. I believe you're having issues with there not being a frame around them, and I'm going to guess you don't see that box around fighters either. It will be under your HUD settings, don't recall which one.
"Don't let them promote you. Don't let them transfer you. Don't let them do anything that takes you off the bridge of that ship, because while you're there... you can make a difference." - James T. Kirk