Is a dynamic / conditional data ref possible ?(water rudders - unlink to rudder)

[mstram]

've modified the C180j's waterrudders.obj file in Blender 2.49, adding a  bone to each armature (there is one for each rudder), then parented the original bone to the new bone.

I've assigned the sim/flightmodel2/controls/water_rudder_deploy_ratio dataref to the new bones, which provides the retractable function.

Now the problem :

The water rudders are connected to the normal rudder with the sim/flightmodel/controls/rdruddef, and sim/flightmodel/controls/ldruddef datarefs.

But when the rudders are retracted, those datrefs should be "disconnected".

Is there a way to do this?

Maybe in python ?

thx

Mike