Other reasons for slowdowns in air

i was reading this thread
http://xtreme-jumps.eu/e107_plugins/forum/forum_viewtopic.php?339345

it was very interesting, but someone there asked what other reason can cause a reduction of speed while in air. well i think that reason can be something commonly called "recoil", but some advanced players call it "punchangle". well i think i can explain a bit what it is, besides i am a normal cs player.

the "recoil" of a weapon, like knife or usp can be understood as a force that makes your gun to aim high when you shoot. that's caused because of the explosion inside the weapon's chamber (not knife ofc).

but when you aren't shooting there r also some other reasons that are affecting your view angles, recoil, body movement (for example when you are moving or when you are standing still but breathing so you are moving too), and also when you are hit by shots. and there is another thing called 'bobbing' you can google it if you want. which is another kind of movement that affects your viewangles, in ground and in air.
https://www.google.com.ar/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=bobbing%2C+cs
there are 3 commands to disable it
cl_bob 0
cl_bobup 0
cl_bobcycle 0

i think these 3 commands have to be unmodified, in other case that would be ilegal.
i started this thread also to know if the community is well aware of this. perhaps some people is changing these values, because there is a lot of people who changed them just to get less recoil when they are shooting. it seems to be an advantage

a lot of people uses this for anti recoil mate, as the difference between knife and usp recoil is noticeable, too, despite a knife doesn't have fire chamber it also produces a minimum "recoil" (view angle modification).
i wanted to know if changing these is ilegal, nobody knows it?
anyways it was said to keep config as default, perhaps it needs clarification