Right now, its impossible to pass extra information to "header_stuff" or set any ADP properties from an include.
This is becoming more inconvenient as we try to cleanup the HTML. The easiest solution people have used is inline styles which cause a maintainence headache.
I think we need two utilities here
1) a way to "append" to header stuff, for example, from an include
2) a way to set title, context, etc from an include
I suspect we'll need a new ADP tag for this.