What if we set a range for properties, and the moment we release slider it assigns a random number between the range, and sticks to that until we touch the slider again 
This behaviour is very helpful for a group of floating objects that are not connected to each other rather following a parent object in a random delay
Or maybe fake fluid simulation
Right now if the bones are in the same flat hierarchy editing constraints for each of them is not an easy job especially when we forget after sometime what was the logic of offsetting the parameters.


Mostly the reason I say that is it seems quite specific to one particular use case. Most of the time you want to pick the value. Having UI to define a range so a value can picked for you seems a pretty complex solution.