Re : php filenames
Hi,
You can achive your goal in part with the RewriteRules allowing you by example to enter http://sitepath/DocBookDev as a short for http://sitepath/tiki-index.php?page=DocBookDev.
This is a partial solution.
If you want more, it will be much more hard, I'm not sure anyone did it yet. You at least need to grep tiki/templates/* for the original filename and replace it everywhere there.
I fear that you will also need to go in (many) other places too, though, so make sure you want to spend some time on it.