I was trying to force the wpmp_switcher cookie through htaccess (I'll explain later) and then, I realized the cookie name was not properly guessed.
I use this on my blog, at http://case.oncle-tom.net.
However, your plugin creates the cookie for 'case.oncle-tom.net'. It should be on '.case.oncle-tom.net'.
Indeed, when I force the creation of the cookie (I redirect m.case.oncle-tom.net to the regular website), with a htaccess RewriteRule ([CO=wpmp_switcher:mobile:case.oncle-tom.net]), the cookie is created with '.case.oncle-tom.net'.
So the browser lives with 2 wpmp_switcher cookies: yours, and mine.
If I do that, it's because I want both redirections: by domain + user agent, with a single living domain.
I want to avoid redirections for mobiles (except for those trying to force the mobile website, with the 'm' subdomain) and ease content sharing through this.
How could we achieve that?
I wanted to bypass WP, because it's too heavy to load all WP depencies just for a redirect.