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The node guide has now been updated with keyboard shortcuts :)

http://acegikmo.com/shaderforge/nodes/
Oh, it hasn't been implemented yet (I'm not sure where you saw that it was)
Cool! And yeah, it's annoying, but there's not much I can do about that apart from making it easier to set the texture name to MainTex, which is a planned feature :)
Ah! Right, that's undocumented at the moment. I will add that later :)
Whoops!
Looks like Spherical Harmonics / Light probes were accidentally on in the refraction shader, for some reason. It should resolve itself just by turning light probes off.

Strange though - the issue should have been there before too, I suspect something might have changed for the worse
There is a readme.txt included in the package, which has a list of all the hotkeys :)
Ctrl+C/V/X/D are currently broken on Windows though, which is a known issue
I just wanted to let you know that the first compile error has now been fixed in 0.19 :)