Batches?

Batches allow you to manipulate multiple list / scenes at once.
Anything from a play message to effect rate.

Yep what he said.

Say you have a whole bunch of chases and you want to tap time them. Just move all the chases to a batch, then stick the batch on a master of your choice. Then you can hold choose and tap play and all the lists chase rates will be updated at once. The same goes when the batch masters fader is set to scale with effect rate or size.

Unfortunately you can't tap in an effects rate