This patch increases the EWMH compliance of icewm on just two hints: _NET_DESKTOP_GEOMETRY and _NET_MOVERESIZE_WINDOW.
This is enough for pytyle2 to work under icewm, which was my primary intent and it was worthwhile: the combination of icewm+pytyle2 is really awesome. It also increases the possibilities of window control with wmctrl of which there are a few scripts out there.
I hope you find it useful.
Thank you, regards!