I don't know if this is possible to achieve with .lua nor do I know if it already exists, but as everyone knows the joints change their color as they get hit, and as they get closer to the breaking point they turn red. Is there a way to know exactly how far they are from the breaking point?
If this doesn't exist it's my suggestion, a script that show exactly how far a joint is from the breaking point.
E.g. - A scale from 0 to 50, with 0 being a totally unharmed joint and 50 being a joint as red as it can possibly be.
This idea might need some tweaking but I would be thankful if someone created a system based on this concept.