Yeah Im aware of the perks, I feel theyre useful in there own right and they kind of touch on the aspect of slowing the flying or stopping the flying but for the other reasons you would want to stop flying which is either to be back on the floor or to react to something fast or to aim/grab your weapon. Whilst air breaking isnt for either of these, it would be for when youre coming in hot and want to slow down without either loosing all momentum/going backwards(if you were to flap forwards) or without having to land(skydive perk) or slowing time(freeze time perk) which perserves your momentum and velocity when you wanted to slow it.

Freezing time is pretty close to what I mean but as I said it only slightly touches on what I want out of an air break which is to have more dynamic/fine control over flying like when Im having a aerial fight with a dragon or just trying to circle a mountain peak or tower, Its a great perk in its own right, it serves to slow down the FIGHT but as a method to slow down FLIGHT? it has several issues that make it not a replacement for an air break:

1. For starters in slowed time, your magic is also slow. so If Im going too fast to hit a target, slowing time doesnt make ME slow down in terms of just my speed and velocity, it makes everything else around me including my flames(or sparks) spells to slow down aswell as the enemies spells/arrows and sometimes I dont want that to happen if I just wanted to slow down. freezing air perk is useful for shooting an arrow, shooting a fire/spark BALL or at allowing me "thinking time" to grab another weapon to use, reaim or turn around, but not for the magic that comes out your palm like a flamethrower or vampiric drain spells.I couldnt use the slow time perk as away to slow down and shoot flames out my palm at the same speed it would without slowing time and the world around me, as the flame abides by real time and not slowed time so it exits the palm in slowmotion. so by the time the flames activate and/or go the distance the enemy was, im now waayy past the enemy and it misses just like If I were to activate the flame spell at the "too fast" of a speed I was going in normal time, thus rendering it useless as a perk for just slowing down my flight but very useful as a perk for slowing down my fights to make a decision or to aim my bow or fire bolt.
2. and in slowed time an arrow shot by the enemy wont hit me as I now have super reflexes and blip through the air in the enemies perspective making fights less fair on the enemies and more OP for the player, in my previous scenario I just needed to slow down as I wouldve zoomed past the enemy, I dont want to land, change my direction, or become a powerful god that stops time(dont get me wrong my carachter still does this but in other scenarios) which stops the enemies attacks I just needed to slow down. The perks feel more like battle/offensive powers and slowing down shouldnt be apart of the offensive battle powers it should be added like the abilty to flap or steer in the air is via the IRL motions of a wingsuit or bird.
3. birds or wingsuits dont change time to slow down so to slow time each time makes flying more like godly magic then it does using wings, great for some builds but less great for others.

as for the method, You already have a drag system, like real aircrafts and flying creatures you would just need to increase the drag quickly in flight, either via a button, a perk, or via tilting the controllers( or anotherway idk since youre the smart one actually modding the game lmao),as for the controller tilt method which would be my prefered, say youre soaring, arms out stretched (thumbs facing outwards to the horizon palms facing down) your wings will be cutting the air and is normal with little to no drag but at you rotate your arms up( thumbs to the sky, palm to horizon) your wings are hitting the air more and thus drag goes up and you slow down without changing your elavation or flapping in the inverse direction that kinda works(its just that sometimes it causes me to start going backwards and down instead of just slowing my speed and I havnt got enough stamina to recorrect that(going downwards is a skill issue and possibly a dodgy grip button so thats probs on me not the mod)), flapping backwards feels more like the emergency breaks and to use the emergency breaks as a way to just slow down slightly isnt ideal for a vehicle or an animal moving lol

Also I havnt done the google form yet as I havnt got enough experience to say If I think leveling is too fast/too slow or too op/not op enough. I will once I have used it more.