I think the plugin should give the option for us to manually set the RSS link.
For example, when we have the domain.com/feed/ redirected with .htaccess to Feedburner link, or more specifically to Feedburner MyBrand which makes the Feedburner RSS url look like this feeds.domain.com/domain
(all links with http of course)
This could probably be fixed by changing the RSS link tag in the templates, but why not give us the option to control this with AddToAny? If not by replacing the link tag, then just allow us to enter the url manually which will appear with the Subscribe button of the plugin.