Is there a way of specifying in a Moodle 2 theme's config.php etc. that it can only be used in the mobile / tablet theme selector? This is because it is useful elsewhere to use the function 'get_device_type()' in 'moodlelib.php' to make alterations specific to a mobile theme and if the device is not mobile / tablet but a mobile / tablet theme is being used, then this might cause issues that are not immediately apparent to the user.
I know with the MyMobile theme there is the option of 'switch to standard theme' but this should still be ok.
But perhaps instead of using 'get_device_type()' or what I'm asking above, could there be an function in $THEME that states 'is_mobile_theme()' instead of having to rely on the device type or theme name?