I’m currently doing the ECS system of an aircraft and I like the MODULAR PNEUMATICS SYSTEM very much, quite powerful system.
I just miss 1 reason to run the AC.
-Sitting in the sun.
It would be nice to get an increased cabin temperature over the OAT in direct sunlight, and even higher if we are on a hard surface. You know , the kind of temp that melts your stickers off the firewall 
Just some extra to have a reason to run the AC.
Edit, oh and ofc we have passengers, depending on the number of seats occupied the cabin temp should increase above ambient as well. Just a nother reason to build a proper ecs 
It would also be great if the cabin temperature and pressures could be utilized in a simple manner that could be implemented on smaller piston-powered aircraft. I’d love to be able to define a heat source (canopy glass in sunlight, proximity to engine and exhaust) that would allow heat generation that could then be reduced via canopy opening, cool air vents, etc. or offset by ambient temperature, to the point where assisted heat generation could be applied, such as electrical heaters.
I’ve tried not that long ago to simulate this in the new pneumatic system, but found that some of the needed abilities either haven’t been fully implemented, or were buggy. For example, you can link to an interactive point, but no effect was noticed when that interactive point was open.
Just small things that could of course be custom coded, but would be rather interesting and quick to include if the system framework was more fleshed out inside the sim.
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It would be nice to also be able to inject custom heat sources/drains from WASM and JS code as well, to further enhance the capabilities of the system rather than having to fully replace it for complex aircraft. That means other third party tools could still use the simvars too.
That suggestion extends to the hydraulic/pneumatic/electrical systems in general really.
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