Restricting BuddyPress Mobile

I'm using the Buddypress Mobile plugin version 1.5.1 with BP 1.2.10 and WPMU 3.2.1, with sub-domains. On the whole this plugin works amazingly well - it generates a very nice iPhone-compatible mobile interface for my BP site, with no hard work on my part.

On my install all the sub-domained MU blogs also take the Buddypress Mobile theme when accessed by mobile devices. Although this usually works very well for your average bullshit blog (I don't think this was the developer's intention), I nonetheless need to turn the BP Mobile theme off on all sub-domained sites.

Anyone know how I can do this? My feeble little mind cannot figger it out... My thanks in advance --