under windows there is a similar setting called “touchpad sensitivity” that adjust the timeout of locking the touchpad after you press a key. If you set it to “most sensitive” then the touchpad will not lock.
However if you noticed is that if you start with using the trackpad and then begin typing, the trackpad will not be locked until you stop using trackpad. then the stuff will kick in.
This also shows that … hm. My PC have a precision touchpad. I thought lenovo is stupid and stuck with a ELAN … oh, that’s the trackpoint. Anyhow.
Precision Touchpad driver. Well done.