As for file or directory names coexisting with the
wiki namespace (root
dir of your wiki as root dir of your site), that is handled fine for me
by this part of my .htaccess that prevents my wiki from interfering
with real files (!-f) and directories (!-d) that happen to be in my
website root dir (eg
mysite.com/here):
What do you do if you want to have an article called robots.txt, or
index.php, or whatever?