Joe,
There are a few pet projects of mine that would benefit being able to render content only type settings like the OuterWrapperPanel settings, something like this:
<portal:SlidePanel runat="server"
RenderContentsOnly="true"
RenderId="false"
/>
I was playing around in my local development installation and got it working but changing the SlidePanel public class to pull from BasePanel instead of Panel, but I'm sure that would probably break things that I am unaware of.
Anyways, if you could do that it would be cool, but it's not important.
Thanks,
-Elijah