Linking keyframes possible?

Hey guys,

I'm creating AE "templates" that are sent to other producers, where lots of the work is pre-produced, you just drop in images, and then drag key-frames to adjust timing and things, and it would be so helpful and great if there was a way to link key frames, so when you move one keyframe, it also moved the one its linked (grouped) to.

I feel like this would be such a handy feature that it must exist, but I can't find it.

Any help is appreciated. Thanks!