Hello, Mr. admin I was testing your mod, and I must say it is amazing, I would just like to tell you about some features you need to mod, for example, in the current version of minecraft 1.11.2, when you are planning with the wings and You use fireworks while you plan, it allows you to fly indefinitely or until you run out of fireworks without being inport if you empty upwards you will fly infinitely, that is to say you never fall
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Unfortunately, I don't think unascribed is working on this mod anymore, since they haven't been responding to requests about it.
Just as a heads up, there's also an issue with camera placement. As I'm sure you know, your hitbox while gliding is lowered to <1 block, but that goes downwards, and the camera stays in the same place.
The hitbox-thing works fine, but when you try to go through a 1-block space, your view will be in the block above you. Some solutions would be to either lower the camera while gliding, or raise the hitbox up by a block, while retaining the 1-block size, but that would leave a visual discrepancy since the player's model is in that lower block.
Since Mojang lowered the camera and didn't bother with a smooth transition of any kind (The camera just jumps down a block when you start gliding, but since you're usually moving to fast and at such extreme angles you don't usually notice it, or learn to ignore it), I think lowering the camera would be best.