[Plugin: Google XML Sitemaps] How to change sitemap name/location without error

I am trying to find a way to change my sitemap name from “sitemap.xml” to something a little less obvious. I have tried changing the name and setting a custom location for the sitemap, but the plugin is not detecting it and has told me either my site has moved or the file has been deleted. I want to change the name so it is not visible by human search, but visible to search engines for crawling.

Any suggestions/help are appreciated!

http://wordpress.org/extend/plugins/google-sitemap-generator/