my question to Dr Bremmer is.... :)

I think I have asked it before....

I would like to change all the shaders in my scene (or just selected ones) so that the original color parameter (a texture map) in the shader tree would be replaced by an operator (eg mixer) that had trhe original texture map as source one and an other texture map as source two.

what would be the best way of doing this  within Carrara - assuming it is possible ?