It's quite tricky to do it by hand. I guess you would have to use an old version of SF in that case.

Duplicate of: http://shaderforge.userecho.com/topic/250416-user-defined-nodes-to-encapsulate-frequently-used-functions/

This has now been added in Shader Forge 1.14 :)

To modify the speed you need to modify the rate of increase. In this case, it would be time*value to increase the speed. If you multiply after the sine, you increase the intensity rather than the speed.

Replied in there!

In that case, read the view direction instead of the normal in the sky shader :)

Good catch!
In the next version, you now select between a set of presets when creating a new shader.
One of them is a sky shader, pre-configured like this :)

This is due to how the shader compiler works. It's currently not prioritized I'm afraid, because these changes tend to cause other issues as well :(

If you're on Unity 4 you'll have to do it manually in that case, as the Unity 4 version of SF is no longer supported

It works for me. Which version of SF are you using?