I agree..
I do the same thing all the time with the: Size M Panel-mount Coaxial Power Jack w/Switch [ RadioShack.com Official Site - America's Technology Store ]
I use this set-up as a KILL KEY & RE-CHARGE port for my rechargable battery packs.
when the key is IN.. power/circuit is broke...
when I insert the re-charge plug (doubles as kill key).. it breaks the circuit.. and charges the batteries..