You can actually use the missile's own sensors for target acquisition. The issue is you have to find your target first, point at (with the airplane or freelook; with Falchion-22 the target has to be less than 15° off boresight) and press "T" to mark it. Then you should see just the diamond, without the square brackets. That means missile is tracking the target (while the vehicle sensors have still no idea).
The automatic locking (like Titan AA) for vehicle weapons hasn't been possible, although we've investigated that option.   TBD
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