I just wanna propose another way to accelerate game in similar to current ql way but without "breaking" maps. I did it a while ago in my mod
In my mod Stepheight dynamicly vary from 18 to 23 depending on your vertical velocity (Vz).
lets explain. If you have vertical velocity Vz than you can reach following height
Vz^2 / 2g + 18

in my mod

if ( Vz^2 / 2g + 18 ) > 23 then Stepheight = 23

if 18 < ( Vz^2 / 2g + 18 ) < 23 then Stepheight = 18 + Vz^2 / 2g

if Vz < 0 then Stepheight = 18

so maximum height still Vz^2 / 2g + 18 and every old trick remain the same but climbing is faster and double jumps are easier and more reproducible