Is it a complicated matter to add a prone position in the tactical portions of the game?
Besides a use in reducing target size and providing a much better firing platform for characters, it could provide an alternative for civilian behavior.
When entering a zone with mixed uninfected humans, aliens and human hive members, and no obvious distinction between them, it would be normal for PHALANX operatives to suspend human rights and treat all non-PHALANX personnel as hostile.
Would it be complicated to create a combat interaction allowing you to spend TUs and put a civilian on the ground, bound and blind-folded and possibly chemically restrained? The inclusion of hypodermics, bean-bags and other nonlethal responses might provide another layer of planning and tactical consideration to the game.
Humans, both infected and otherwise would be processed and released, or researched and executed, as the case may be. Perhaps additional research will allow the development of an antidote, or an innoculation, or an exploding cortex bomb that would kill a PHALANX member before the infection can take them over. Not that you'd want that.