Customizing Phab

After working with Phab for a while I realize I'd like to customize layout of a revision. When I work with a revision I most often read comments and source code and write my replies (often based on comments). The problem is that comments are located at the top of a page whereas the text field for writing a reply is located at the bottom. I wonder if there is a way to: a) collapse "Revision Update History", "Local Commits", "Table of Contents" and "Open Revisions Affecting These Files"? b) or move them below "Leap Into Action" section ? I can't find any such settings so I suppose that's not possible by default. Is there any way to extend Phab's functionality do allow customizing layout in a way described above? Janek