If I create a parameter with value of 0 (so I have the flexibility to change in the future) and use it in a sketch dimension, Fusion doesn't allow me. But if I set the value to non zero (e.g. 0.1) and use it and then go back and change to 0, this is OK. So why not make it possible to do this without these extra steps? (and while I didn't check this right now, having negative values should be possible as well)