Pivot Mower

This idea is intended to make corner negotiation and mowing sideways along hillsides easier. Zimmy's idea is the only one I've found that resembles it at all, but it's still quite different.

The idea I'm proposing here is a mower (standard 21-inch self-propelled) with the handlebars attached to a circular pivot such that you can, by pulling a simple lever, free the handle to swing without restriction 360 degrees about the engine. When it gets to the desired position, simply release the lever to lock it there. With this design, you could mow along a hillside to the side or in front of the mower instead of behind it, to make it easier to fight gravity and keep the mower from sliding downward. By swinging the handle out to the side, you could pivot the mower almost on a dime without getting pinned between it and a fence, wall, or other obstacle.

Now, I'm not sure how to make it work without getting all the cables messed up, but as always, I'm open to suggestion. Any ideas?

Edit: I think a way to negate the problem with cables getting twisted would be to do without them completely. Instead of a standard, old-fashioned cable throttle, use radio controls mounted on the handle. While you could definitely do it easier by using a remote control from a lawn chair, the idea is to still get some exercise while mowing the lawn. And if you think using a self-propelled mower keeps you from getting any exercise, you're quite mistaken. You still have to walk to keep up with it, and you still have to fight gravity on hillsides.