Vertically stacked tabs in Konqueror?

[homoludens]

Is it possible somehow to stack Konqueror's tabs vertically on top of teach 
other, rather than having them lined up horizontally? And if so, how would I 
go about it?

Basically, I'm looking for a way to duplicate the functionality of Firefox's 
Tree Style Tab plugin (http://piro.sakura.ne.jp/xul/_treestyletab.html.en). 
I'm actually surprised that horizontal tabs are not more widespread, given 
that they offer a great overview over a large number of tabs, plus, if one is 
also able to indent/dedent and rearrange them, a very smart way of organizing 
tabs.

Cheers,

Robert