Ablative Surfaces & Drag Reduction?

I was reading this article:

http://www.eurekalert.org/pub_releas...-sds051404.php

We have all read about how ablative materials can help to reduce
thermal load on heat shields by flaking off hot bits. Can ablative
materials be used to appreciably reduce drag, in a hypervelocity
scramjet for example?

Conversely, could it be possible to significantly boost drag, or even
lift, by having a wing or aerobody surface carpeted with tiny little
actuated flapping wings? I've read about how flapping wings are being
investigated for air vehicles for the thin atmosphere of mars. Could
lots of little tiny flappers suffice instead?