Editing tooltip for more info I would like to customize the mouse-over tooltip to provide me with more detailed info about nodes and other things. Is there a relatively easy way to do this? I'm not a coder.
You'll have to compile blender from source if you want to write your own.

Once you have the source code, most tooltip text is defined somewhere in /source/blender/makesrna/intern/.

If you don't want to compile blender yourself, you can write your suggestions here.