Disable composition for only one window in xfwm4

[jEsuSdA 8)]

Hi!

I have a trouble with a game "Stratagus Wargus" who is not working well 
with xfwm4 when compositing is enabled.

The game background appears transparent, so, it can be played.

The solution is disable xfwm4 compositing before start playing, and 
re-enable after that.

In Compiz there are a plugin called "Window Rules" who can be used to 
"disable ARGB visuals", so this game can be played without disable the 
entire compiz composition. Just adding (title=Stratagus) to the "disable 
ARGB visuals" rule, make the magic, and the window game is not forced to 
be transparent.

Screenshot with Compiz "disable ARGB Visuals" working: 
http://i.imgur.com/2BIGZBs.png

My question is: ¿Is there any way to do something like that with xfwm4, 
force to avoid argb visuals for only one window?

Thanks! ;)