Customizing CustomPress

Hi, I have several specific questions about tailoring Custom Press to my needs.

1. How do I change the layout of the data entry/edit part?

2. How do (can?) I add additional ‘things’ to the data types I can use as input?

3. How do (can?) I made the plugin “Ultimate TinyMCE PRO” the editor for the multi-line text boxes? (I think there is a plugin that does something like this for widgets, I don’t want to trust it without your blessing.)

4. I recall from the mists of my mind that there is a discussion of slugs in display. Also I think I can use slugs to define the template form; how?

Is there any chance that this stuff can make its way into a document? I am willing to help; after I know what I am doing.