I believe it would be utterly cool to have subheader tabs, too. They could be generated by inserting a <subheadertabs /> tag which picks up on the second header, e.g.
= Header 1 = == Subheader 1 == == Subheader 2 == <subheadertabs /> = Header 2 = = Header 3 = <headertabs />
Thus two second level headers would be rendered below "Header 1". Cheers