DMF, "Auto" Focus Peaking, and SSM Lenses on the a77

Neither the Tamron 60mm nor the 70-300 USD have anything other than an "AF/MF" switch. Tamron does label the 70-300 as a "USD," which perhaps is closer to Sony's SSM than whatever drives the 60mm--which isn't called "USD" (although the 60mm does have direct manual focus at any time). That's the only thing I can think of at the moment....