Perform Batch Actions

I can't find this in the scripting AP - but a really useful tool would be something that allows you to perform actions on one animation, and apply them to all other animations.

for instance, changing certain aspects of an animset - I'd like to be able to create and adjust another layer, and have those same adjustments apply to other animations in the project automatically.  It's quite tedious to manually go create all the layers and copy and paste the same keys in all of them repeatedly - and seems like something that wouldn't be terribly hard to implement.