As so many ego-style batterys have issues with the positive post getting pushed down to far, and with attys having various length center pins (my vi novas all have differing length center posts), I would like to see adjustable battery positive posts. A threaded post that could be screwed up or down would be easiest. But a spring loaded post, like the one on my new Tesla!, seems to be the best and coolest.
P.S. Do not support the government regulation of any of this. As soon as politicians step in, then suddenly its fate is in the hands of the corporation with the most lobbyists and the most Money. Take the issue of GM food: Monsanto has fat stacks of cash, so they get to write the laws, laws which benefit their wallet and disregard humanity. Rant sequence concluded.