my JDAM idea borrows heavily from the current Heavy AT kit. so the launcher, lets say for example the SRAW, is replaced by the laser designator. it targets exactly the same as the SRAW, as in you have to keep it positioned on the target to get a hit. now obviously the missile part will be replaced by a JDAM bomb, but instead of spawning right out of the "launcher" it will spawn wayyy up high in the sky, and it wont actually "fall" but it will act just like a missile would, it would follow whereever you are spotting with the designator. now since it spawned so high up, it will travel down which will look just like its gravity is bringing it down when really its basically just a glorified heavy AT missile following its target. and a moving target could be hit by just keeping the designator trained on it. also when the "missile" is fired maybe it could cue the sound of a high flying jet passing overhead.
maybe make it so only an officer kit can do this, or maybe a FAC {forward air controller} kit could be made. like a pickup kit that each side only gets 1 of and respawns like once every 5 or 10 minutes. here is a professionally made visual aid to help people understand:






