How can I record an Adobe meeting with audio from BT MeetMe?

You may be able to use the Universal Voice tool. When logged into Connect Central, go to My Profile > My Audio Providers > New Provider. Put in the relevant information for calling into your BT confrence bridge.

Full instructions on filling in the fields can be found here (you don't need to do this in the Admin section though): http://www.connectusers.com/tutorials/2009/11/uv_admin_setup/

Then when that process is done, go to My Audio Prioviders, in My Profile and select New Profile. Select the profile you just created and click Save. Then, at the bottom of the Edit page for your meeting room, you should have the option to integrate  your BT phone bridge into the connect room.

You can connect the phone bridge via the Audio menu in the meeting room, and if everyone is going to be on the phone, I would disable the audio broadcast for the bridge, so attendees don't hear the audio through their phone and computer. The audio will still be recorded with the presentation.