It could work like the current sitemap plugin (archives) that I use and would need a single page created for it with the post slug called coppermine-gallery.
This would avoid the problem of having to build another template for a completely different application. It would also allow me to use wordpress on a much more powerful applications That I am currently working on. Querystrings and mod rewrite support should eventually be supported, there is already a plugin that allows content admin to publish, upload and create pictures for admin.
some possible variables that I can think of
$album
$Pic
$Filmstrip
$browsemode
another nice feature would be to prevent direct picture calling and store all the pictures in a private folder on the server, pictures would then be called using a php file that block other sites from directly linking to our pictures