link layers in the timeline
It would be very nice to be able to link layers in the timeline. Sometimes a lot of layers together makes up an effect and its preferable not to move it into a Pre-comp. And when needing to move layers in the timeline it would have been nice to be able to link certain layers together so when you move them forward/backward in time, all the linked layers will follow.
Avinash Lobo commented
The workaround is to give them their own label colour. Then you can Select Label Group and move them together.