FPSC is more of an editor, rather than an engine, so lots of things are done for you.
Change texture of a x.model though script.
Yes
Dynamic mirrors
Might have to use a shader
Render to texture
No (why?)
Dynamic RGB lights
No
Dynamic texturing effects such as procedurals, animations, blending, and morphing
Shaders again
Lighting bolts
Using a decal you oculd make a flash appear somewhere.
User extendible particle systems
No
Liquid engine for water, & containers...
Liquid engine?!?
Animated level textures
Not really
Quote: "Decal engine NOT just for bullet holes (bloodstains,cracks in walls, Logo,etc) "
Blood is automatic. You could place signs on walls for other things.
Translucent world geometry
Don't think so
3D sound positioning and attenuation
Again, all automatic. Fo for example enemies walking around etc are all done in 3d.
Is there gib support though script.
Don't think so.
(sorry, didn't have the heart to go through quoting all of that

)