Hi borisb2,
As mentioned earlier, Audio Unit full screen support is on our list and will be great in terms of usability.
In regards to third party app suppliers supporting the Audio Unit standard:
I strongly suggest to let them know about your request. The more requests they recieve, the more likely they are going to think about it. It does not help to post this into the Cubasis forum - we already fully support AU… 
Best,
Lars