Macro Questions

I had a few simple questions about macros I was hoping to have answered.

First of all, is it possible for a macro to use another macro? By either using it directly or simply using what ever is in a certain slot in my action bar?(In this case, another macro)

Secondly, is it possible to make a macro use keyboard functions?
In the case I want to use it in, I want to make it press 0 twice so it will automatically select and start crafting the item I want.

Lastly, Is there a way to make gathering easier?
In other words, after I click on the node I want it to keep gathering a specific item or slot so I don't have to keep clicking it.

Thanks in advanced!