Hello, it’s me again 
Active support is a thing not really in Trem at the moment, so this topic is created to spam ideas for supportive stuff! 
Human Portable Medkits- heal others.
Granger Tunnel network- a purchasable buildables that is silent, and allows aliens to teleport to it’s location through a hovel.
Mark of Death type debuff dispenser- anything that marks enemies for increased damage or any other negative effect.
And the list goes on. Please, feel free to add to a pool of ideas, from which the developers might choose to choose concepts from