Hi. I have a suggestion. Maybe that's not hard to do, so maybe you would consider this.
Let's say I have an arm_R bone with some sub-bones and constraints between them. It would be great if, when I press duplicate on bone arm_R I had some popup with question about duplicating related constraints. So if there was constraint between some path_arm_R and some bones_R which are under arm_R in hierarchy, it also would be duplicated (with changing Bones and Target acordingly). If there was a constraint between arm_R and Torso, it would be copied as a constraint between arm_R2 and Torso (as torso was above arm_R in hierarchy and it's not duplicated).
Also, if this worked, it would be super cool if I could select arm_R bone and IK_arm_R_target bone (which is not under arm_R in hierarchy ofc) and to duplicate it with the IK constraint. Currently I can only duplicate one bone at a time.