[development] Protecting URLS From Path

I maintain an SSO module that has an alternate login path (cas instead of user/login). I recently got a post asking if there was a way for me to programmatically protect it from being overridden. A user had created a page describing the single sign on process and given it the same URL as my menu_hook was registered, thus overriding the behavior provided by my module. So I thought I'd ask. Anyone know of a way for me to ensure that other menu paths (specifically aliases) cannot override the one provided by my module? Dave