NB! It seems this console command is not compatible with CS2.
Command Profile

M_CUSTOMACCEL_EXPONENT

CS:GO

This is the command that sets what speed you need to be moving your mouse before the custom mouse acceleration kicks in, if you have that command enabled too.

Syntax
m_customaccel_exponent [Start Point]

Description

This is the command that sets what speed you need to be moving your mouse before the custom mouse acceleration kicks in, if you have that command enabled too.

Syntax And Arguments

m_customaccel_exponent [Start Point]
Start Point This is the value that dictates when your mouse acceleration begins speeding up your mouse. The higher you set this command, the sooner its activated, and the more out-of-control your mouse becomes. The default value for this command is 1.05.