|Boolean values: yes or no, true or false, 1 or 0
If set, this warhead will mind-control the target instead of inflicting damage. The effect is instant, and ignores whether the weapon actually hit the target or not. Objects that have ImmuneToPsionics=yes are completely immune, and cannot be targeted.
The owner can only target and control one object at a time, and will lose control over the first target if it fires on a second one.
The Damage value of the weapon defines how many objects total can be controlled by the firer. Values greater than 1 prevent previously established mind-control links from being lost. Because of that, after reaching the limit, no new object can be controlled until at least one of the old ones is destroyed.
The game only checks the Primary weapon for MindControl=yes warhead (giving it to a Secondary causes an Internal Error). Furthermore, changing Damage on ElitePrimary doesn't affect how many objects can be controlled - only Primary is checked.