I play on PC using an Xbox 360 wired controller. One thing that I will do in order to target the adds is tilt my camera down so they are the only targetable item in my field of view and quick select them after deselecting Titan. Or if you're tanking the adds, just stand behind titan and when he spawns them there aren't any additional targets (bombs) on the field so it makes them very easy to quick select / pickup.

If you're approaching this from the targeting perspective of a melee dps or ranged, altering your camera position is always helpful as well.

Also, I want to say that if you hold down R2 and push L1 on your controller it should quick select through the current available aggro table of enemies. (I believe that is the button combination since I don't have my controller on me at work and I do that by muscle memory more than anything xD ).

Hope this helps a little =D