Tuxor,
a visual feed back would be there with the numerical display anyway.
Do you read scientific books? Then you all the time need to jump around (TOC, references, graphs).
A permanent UNDO button and a few direct access bookmarks to jump quickly to TOC, index or references, would be MUCH more useful than this display IMO.
EDIT: user defineable permanent and variable buttons would be the best, ofcourse. But the current solution IMO is the worst of all.