Thermal-based stealth system

Currently there is no real way to detect enemy ships unless their antenna/beacon is on. I think that adding some kind of infrared sensor block could make combat much more interesting. I'm no game designer but I think the way it should work is like this:

• Base thermal energy output comes from thrusters and reactors, even in idle (output would dramatically increase if thrusters are on)
• Energy is somewhat decreased depending on how many blocks are in the way i.e. looking at a ship's rear with lots of thrust makes the sensor light up, but looking at the nose makes it much dimmer because the armour is blocking most of the heat.
• There could be some kind of thermal battery system that takes the heat in reducing output.

I think combat will be much more interesting if this is added as it gives a reason to have smaller ships or even stealth ships, because battleships would be visible from tens of kilometres away whereas a stealth ship powered down parked next to an asteroid is practically invisible to sensors.

This could open up opportunities for things like ambushes, or even the construction of a secret detection satellite to spy on enemies.