In flwm, if you drop a script in /.OnDemand, it automagically appears in the OnDemand right-click menu. It allows me to drop my own custom scripts in there and have them available on demand. I find this a very nifty feature indeed.
It would be great if this niftiness could be extended to the other wms as well. It would yet allow another, perhaps more powerful, way for users to tweak their setups.