Opps nevermind.. forgot about glow, btw can you overdrive glow? That would give you some bloom effects.
Good we have AO.. my checklist is getting filled up :-)
How does Specular compare to Metal?
We have
HDR Bloom now. If you make the glow bright enough, it will practically blind the player at times.
Specular works just as well as Metalness. It also makes more sense in terms of currently made assets for FSO. Specular should also exist in any tool that supports metalness, since it's possibly to convert between them using special filtering techniques on the diffuse and spec/metal map.
I know you use Substance Painter, but I've been using Quixel Suite 2, which natively supports over 15 different workflows. The only metalness workflows it supports are for UE4, Unity 5, and Arnold. It supports far more Specular workflows and Producer specific GGX workflows (Disney GGX for example). The default Specular PBR has extremely similar results in Quixel Suite's native renderer 3Do and FSO, so that is my preferred workflow thus far.