I was thinking about rollerblades. They would be crafted like:
= Nothing, = Boots (Except quantum)
The rollerblades would be equipped like normal shoes, but once equipped, you will move at 1/4 of walking speed. If you hold down forward, you will slowly speed up to that of quantum boots pants. It would take about 5 seconds to speed up to top speed, and 3 seconds to slow down. If you double tap forward, you lock in, and keep going forward. If you try to turn, only your camera will move, and to turn, you need to strafe. Turn speed depends on how fast you're going.
The durability depends on what boots you use. The protect you however much the boots would normally, and the rubber boots would negate fall damage. If you crash into a wall, you sustain damage based on the speed. It also has a chance to break off the wheels, leaving you with normal boots.
The rollerblades, using refined iron wheel technology, can work on ice and ground.
The advantages over q-boots:
Don't need charging
Great for long, straight distances
Cheap
Disadvantages:
Sluggish speed at first
Difficult turning at speed
Chance of breaking
Has to be on flat land
Why?
It's great for traveling a long distance, like on a walkway. It would allow you to move efficiently along large distances, which could be especially useful for smp, where you might do lots of traveling between bases, where it would be easier to lock in your rollerblades than hold control for 10 minutes. They definitely aren't nearly as useful as q-boots, but provide a nice middle ground.
