That hack is undetectable, when you move up in air, noone will see it before you jump (if you don't jump, you get dc) , so, when you move in air high as you want, others will see you in the ground untill you press "Space" or another Jump key.
I have used this in BG:s also and noone has reported me.
And also, you would get reported without the hack, and you can close the hack when you have the speed.