Random offset modifier for graph editor keyframes

I sometimes end up doing projects where I have multiple animated objects with same animation. So it would be extremely helpful if I had a way to add random offset to all of those object or material animations very fast.

For examle I am having lots of objects with animated flashing lights, done with cycles material editor. (value node + color ramp). I don't wanna have them all flash their lights in same timing tho, but to change the timing randomly for each of them seem to be much more tedious task than what I at start believed.

So, to have one very well working solution would be to have a random offset modifier in the graph editor modifiers list, and it would quite much be the final and easy to use solution for this kind of problems.

The modifier would allow offsetting the keyframes randomly in x or y axis. Also there should be some value that controls the max amount of offset the modifier is doing.