mixture and prop pitch

[Eshark]

Hi All
Iam right assume prop pich and mixture cannot be set up in increments,because try as I might I cannot to bind a key to prop pitch 90%,80% or any other percentage come to to think of it,same with mixture it either on rich or lean no in between.
I dont know what iam doing wrong but only certain keys seem to work and they are either full or minimum