Unfortunately, we can't really do that. While we don't like that the Facebook Page Tabs aren't shown in mobile, we can't do much about it. Facebook has restrictions on what can and can't be done within an Page Tab. Setting up a Page tab whose primary purpose is to redirect the user to an external website off Facebook.com can get your application blocked, which causes lots of other problems.
We try to steer well inside of Facebook's API terms of service to make sure our users don't run afoul and get in trouble for things they may not even be aware are against the rules.
I hope that helps answer your question, but if you have any other feedback or suggestions, we're always listening.
Thanks,
Alex