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

JOY_DIAGONALPOV

CS:GO

This command causes the point of view (POV) manipulator when using a joystick operate on a diagonal basis when turned on.

Syntax
joy_diagonalpov [0 / 1]

Description

This command causes the point of view (POV) manipulator when using a joystick operate on a diagonal basis when turned on.

Syntax And Arguments

joy_diagonalpov [0 / 1]
0 / 1 Enter a 1 here to turn on being able to adjust your POV values to work diagonally, and enter a 0 to turn off the feature (default).