I personally have never encountered the breaking legs issue and hadn't heard of it until now, don't know if it's to to with technique, because I'm obviously really good at placing things

It's a good idea but you have to consider difficulties with implementation. Also it can be abused in some ways. I can come on the server, take out a loan of 15k, and I can afford to do a full diamond run, assuming I pay 150k back, I still have over 50k profit. This could remove a lot of the smaller ...

The server has managed perfectly fine for a long period of time without this gap, so why should the fact that the jail is there be a reason to turn that into a border gap?