Right clicking with a Fireworks Rocket while gliding with Elytra should affect the player movement speed.
Instead of affecting the player movement speed the Fireworks Rocket spawns a fireworks_rocket entity.
Steps to Reproduce:
1. Start gliding with Elytra
2. Right click with a Fireworks Rocket.
this feature was added in 1.11.1 as a feature other than bug fixes not in the Holiday Update (1.9)