I really feel that the infiltrator does not have enough teamwork oriented stuff or AV stuff. I think they should get some sort of Target Acquisition Gear, like a laser that does no damage but halves lock-on time for all allies targeting that vehicle.
I have been thinking about a TAG system for a while (though it was going to mounted on a max as part of a "Comand max" style thing) and my overall thoughts were as follows. 1. signifigantly reduced lock on time (same as yours) 2. spots the target, the cheveron (dorito) above the targets head is distinct from other doritos, leting people know that target is TAGed. This lets it operate on kind of a priority target indicator for focus fire. 3. Makes countermesures (flares, IR smoke, etc) ineffective
