I haven't tested the new version of this mod but it looks like there may be a problem switching between mobile and full sites.
The new sitechoice.php looks for a querystring variable called 'fullsite', but the code looking for a querystring variable called 'fullsiteoverride' is still in init_templates.php.
It looks to me like the init_templates.php included in the new distribution is an old one. I think it should just look for a cookie called 'siteversion' and show the appropriate template based on that rather than looking at querystring variables.
As I mentioned, I haven't tested this yet so I could be wrong!