Hi,
No, but you can indeed just remove the rewrite rule from it if the module isn't being used.
A blank page is nothing to do with Ceon URI Mapping, but must be a problem with your installation of the Sitemap module. Check the "cache" folder for your store for myDebug files.. they'll probably exist and list a PHP error to do with a mistaken installation (missing file or something?) of the Sitemap module.
Unfortunately I'll have to refer you to the thread for that module for further help with this. Hopefully though, that's enough information for you to get this fixed!
All the best...
Conor
ceon
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