I just wish to add to Ashley's excellent answer that if you feel like coding in the end you can always make your owns plugins and behaviors thanks to C2's SDK.
It's pretty straight-forward, a lot of fun, it can be useful depending on your project but be aware that if there was another exporter made for C2, you would then have to make a plugin for this exporter too before exporting the game with it. (oops, Ashley ninja'd :/ )
And finaly for those wanting some debugging, you can always create a condition "In preview" and display some values from there for your debugging needs. It would require a text or a browser object and the alert action, but it's often useful.
so perhaps some simple documentation or perhaps more in depth descriptions in their respective selection windows is all that's needed.
Do you mean like the inline documentation in codition/actions/expressions window ?
Also the manual is soon coming, it takes time to write.