The jack shell contacting the tip on insertion can have other problems. This is not a problem, as long as there are no other cables connected, and nothing connected to ground. Anything from a spark to fire. Also, the tip may cause a short between the shell and tip contacts on the jack during insertion. All plugs are not created equal in this respect.
Coaxial plugs are normal, and anderson powerpoles are widely accepted as a standard.
All my 12V gear is now powerpoled, but the Lib isn't strictly a 12V device, so I haven't powerpoled it. As soon as the key is released it comes back on. A tip from a former fireman. Those things burn unbelievably fast. In fact if I do NOT have the battery in the Lib it will turn off during starting.