Tabbed windows in window manager?

[Timothy Beyer <beyert cs ucr edu>]

I know this has probably been brought up some time in the past, but I
was wondering if anyone had any plans to add tabbing/grouping
functionality into sawfish.  I realize that the drag series of themes does
something like this, but from personal experimentation, it appears that
those themes only allow the moving around of titlebars.

Anyway, I was thinking about integrating "real" tabbing/grouping
functionality with the wm (via Merlin's sawfish
extensions, perhaps extending the "pile.") Anyway, I realize that tabbing
is not intended to be part of the core wm functionality
(nor Merlin's extensions, though I consider them to be extremely useful)
for the sake of simplicity, but I was wondering if anyone could give me
some insight to makes tabs better integrated into the wm.

I apologize if this message is off-topic.  Anyway, if anyone is interested
in adding this functionality, or could help me out, that would be great.

Regards,
Tim