plugin support in metacity

[Gregory Kovriga <gkovriga techunix technion ac il>]

Hi,
is it possible to add (if doesn't exist yet) a plugin support to metacity?
The general idea is that a plugin would be able to add additional visual 
effects/functionality to the tasks performed by the window manager 
without adding new dependencies to the core.
Possible extensions might include:
1. desktop chooser plugin, similar to 3ddesk
2. full-screen application chooser, similar to expocity or kompose

Thanks,
Gregory.