The answer to the second question of yours, is to make a variable that you add to the any of the sections (reference variable to the sys_user table), and you can set the field Default Value to: javascript:gs.getUserID(). When the builder user edits the cat item in Catalog Builder, his user account will automatically populate in there. You can also set the field by a ui policy to read only, so he cannot change it. (Depending on your use case you might want to limit which resources can / should edit that field. Keep in mind, in the background view a lot of 'other' users can change field. - I implemented a logic for that field by ACL.) It all depends on your process.
