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Hi @Levin
I tested the version 1.3 and I really liked your mod, but as a feedback, I found some things that could improve the experience :)

1. If no key is pressed when flying, the player doesn't fly in a straight line parallel to the ground. Instead he gains altitude. This is caused in the line 108 of the script.

-Original: ENTITY.APPLY_FORCE_TO_ENTITY(player, 1,0,0,0.275, 0,0,0, true, false, true, true, true, true).
-My fix: ENTITY.APPLY_FORCE_TO_ENTITY(player, 1,0,0,0.12, 0,0,0, true, false, true, true, true, true)

2. When pressing the key S, there's no acceleration and the change in the flight direction is too brusque. For gaining altitude more gradually, I made a few lines (I'm a newbie in coding so maybe there's a better workaround for it :p)

-Original: if(parastate == 0 and velocity.z < 40)then
if(get_key_pressed(Keys.S)or CONTROLS.IS_CONTROL_PRESSED(2,196))then
ENTITY.SET_ENTITY_VELOCITY(player, velocity.x, velocity.y, velocity.z+1.5)
end
end

-Fix: if(parastate == 0 and velocity.z < 25)then
if(get_key_pressed(Keys.S)or CONTROLS.IS_CONTROL_PRESSED(2,196))then
ENTITY.SET_ENTITY_VELOCITY(player, velocity.x, velocity.y, velocity.z+0.2)
end
end
if(parastate == 0 and velocity.z < 40 and velocity.z > 23)then
if(get_key_pressed(Keys.S)or CONTROLS.IS_CONTROL_PRESSED(2,196))then
ENTITY.SET_ENTITY_VELOCITY(player, velocity.x, velocity.y, velocity.z+1.5)
end
end

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The full 1.3 with these 2 fixes: http://codeviewer.org/view/code:5132
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Suggestions:

1. air break + opposite flight direction impulse. (Tried it by ENTITY.APPLY_FORCE_TO_ENTITY and each velocity vector multiplied by -1 but didn't work, idk why :( ). Here's an example: http://www.youtube.com/watch?v=7phiJ-vxr0A&amp;t=1m43s

2. A ragdoll on command would be nice for doing "tricks" when flying. I noticed that, when crashing against something and entering ragdoll, I can still reenter flight mode by pressing Shift+Control, which means flying in an another direction fastly. Being able to do this on the fly would be awesome.

3. PostFx filter. There are some already in the game files that could look great when pressing turbo (shift or ctrl). Here's one of them (http://i.gyazo.com/ebf8e21e9975cebb6986090a34f7f198.gif) The Endeavour trainer, which can apply them, is ASI instead of LUA, so I don't know if it can be made with this mod.
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Thanks for the mod again!