The sample skin is just a test UI to expose the pitch slider. I think it will probably end up being a knob. 

I think rate slider, keylock button and pitch knob give you full control. You can set the pitch wherever you want with the pitch knob and then keylock works as usual with respect to the rate slider. 

Setup number 2 you describe doesn't let the user do pitch adjusts with rate change. (which corresponds to keylock off, pitch adjusted in setup number 1).