Walk with Always Sprint on

I stumbled upon this in the Wiki:

• bind_US_standard “LSHIFT” “+speed; +walk” Is a bind to set Shift to walk. This lets you use Shift to circumvent the shoot delay while sprinting, while still using Always Sprint.

I was very happy to find it since I always feel the downside when using the EVA-8 but prioritise always sprinting over the handling of a weapon I rarely use.

But: When I set this launch option i am just always walking in Game, no way for me to sprint in any way and pressing the bound Button has no result.

What am I missing? Have any of you configured this? Or is this old and can not be set up anymore?