If you lay down and press Shift+W your character will fast crawl. Pressing Y again results in the character standing up. This is intended behaviour and there is no change needed.
/downvoted

fuck yes! i mean crtl + w. I will change that.

The sitting/high prone is a variation of the prone and Y is the prone toggle. Still, this is expected behaviour.

imo expected would be laying down. First the character lay´s down and than stands up, with just one press of the button y.

The Y is a toggle, and since the sitting position is high PRONE it toggles it to the standing position.

We don´t need a toggle to stand up, we have x as a toggle to kneel an stand up, from prone position.

Then, you can reconfigure the controls.

Duplicate of #92.