The Maverick interface is not satisfactory.
1) You can't set a Launch Bearing
2) There is no way to set the enable and shut down points, the missile will just behave exactly like a Maverick with a longer range and a radar seeker, but a slower, seaskimmer with a slightly larger warhead. In other words, a Mavpoon but with the specs of a Harpoon behaving like a Maverick.
The SLAM-ER is not satisfactory either
3) You can't set an enable point, the missile will always shut down at the last waypoint
At this point, the choice is SLAM-ER and Maverick or SLAM-ER and Mavpoon.
I wish I could do something but unless I've missed something, I can't.