[Al Skierkiewicz]

Mike,
The bigger problem is that the contacts on any phone plug/jack combination allow two contacts to be shorted by the mating connector during insertion. There is only one manufacturer that I know of that has locking phone plugs in the 1/4" size that would prevent the connector pulling out during motion. If you think about it, there is no large surface area contact when the connectors are mated.
The Neutrik mono version of the 1/4" claim current rating of 15 amps or less. The stereo (three conductor) is likely much less. Please be advised that all phone plugs are not made identical. Extreme variations exist in finished diameter, plating, insulation and tip design.