[dwm] Using dwm as a nested manager?

[Jorge Vargas]

Hi, I have been thinking about this for some time, and I like dwm a
lot but I don't like it to manage all my windows, so I was wondering
if it's possible to nest it inside another manager and tell it to
handle only some windows? Please note I used this a long time ago in
the 2.x releases so I'm not familiar with the codebase anymore.