Throttled rocket power

I propose making a throttled rockets that could be turned on and off while flying with the elytra.

The rocket would be crafted with a copper ingots in a "V" shape, like an upside down version of the glass to make a water bottle, at the bottom of the crafting table. An existing firework rocket would go in the middle at the top. This would give an additional, late-game use for copper.

To use, you would hold the rocket and then hold down the "use" button. As long as the button is held, the rocket would provide acceleration and accumulate "damage" which would essentially be the remaining fuel. Once the "fuel" is gone, the rocket breaks and disappears like a tool or weapon.

This would give the ability to fine-tune flight speed as switching between flight-duration rockets is very coarse.