Feature request - one of the few things I'd hate to give up by leaving Ubuntu is the PPA system, however the one thing I don't like about it is that it puts pot

Feature request - one of the few things I'd hate to give up by leaving Ubuntu is the PPA system, however the one thing I don't like about it is that it puts potentially untrusted (or at least not systematically vetted) PPA packages into the system folders. An interesting improvement of that would be a PPA system that uses Debian's awesome Update Alternatives tool to install PPA's to, say, /opt, soft link them into the system folders, and then manage side-by-versions, rollbacks, etc. with update-alternatives. By way of example, the Rbenv in Ubuntu repositories was rewritten to use Update Alternatives to manage Ruby version shims. It would be really interesting to have an entire PPA system similarly based on that.