Be me. Get home from work. Check a thread I spoke in earlier.
This about sums things up for me:

Having some time to sit and think rationally I would just like to point out it’s one thing to have a tail “sock” that’s stitched to your pants, it’s another thing entirely to just belt a sack to your tail. That said adding a special case body-part that takes damage really isn’t high on the to-do list because of the other things that need done, as KA said however you’re welcome to do the work yourself. (…You’ll have my personal hatred and thanks at the same time but yeah.)
On a related note, just “letting it get damaged until it’s broken” would best case result in loosing it, but what’s more likely is you’d end up with necrotic tissue hanging off your spine (because that’s what a tail attaches to.)
On a side note, if you’re going to add the ability to ‘loose’ broken parts, might want to apply it to arms and legs as well. People have been asking about that for awhile, as well as bionic replacements. If you’re going for the golden brownie points on the forums that is.