Maximize to Next Window ("Bump")

[Adam Kessel]

Is there any way to configure an action so that a window only maximizes
up to the next window in either direction? I used to have such a
keybinding in sawfish and used it extensively, but I haven't found any
documented way to do it with openbox.  Ideally I would have two actions
bound to different keys: maximize over everything, and maximize up to the
next window (horizontal and/or vertical).  Possible?
-- 
Adam Rosi-Kessel
http://adam.rosi-kessel.org