imaginary(?) window manager feature

[David Nicol]

So I have been experimenting with alternatives to lwm, which is pleasantly
out-of-the-way and allows me to run KDE kicker for a "task bar"

What I want is a wm with a particular twist on a tiling feature : a way to
dock windows to each other so that the bar between them can be moved back and
forth, resizing both (or all) of the so-connected frames.

Is anyone aware of a wm that can do that?

There are "docking" features in various wm's task-bar kind of things, which this
idea is pretty close to; it would allow arbitrary windows to dock with
each other,
(and also undock of course); so I could for instance dock all my xload windows
to each other and have a "raft" of xloads that would raise/lower, cycle, etc
as a unit.

I had this idea after experimenting with ratpoison again yesterday.
Ratpoison allows
splitting windows in half either horiz of vert but does not support
(at least not
without reading the whole instructions) splitting windows somewhere
other than half,
or mousing the dividing line up/down or left/right.

thoughts?

happy new year