2010/11/10 Daniel Friesen lists@nadir-seen-fire.com:
If resourceloader isn't listening to $wgStyleDirectory then it's a bug that should be fixed, unless resourceloader has a damn good reason for ignoring existing configuration.
It's a bug that should be fixed and can be fixed relatively easily. However, Trevor also said that other parts of MW already don't obey $wgStyleDirectory . Maybe someone needs to try setting it and see if things break.
Roan Kattouw (Catrope)