I think this is more of a bug fix than a feature request. For whatever reason, I can't use the delete key in the X & Y grid spacing boxes.
Go to Preferences -> Grid. Click into the input boxes for X or Y spacing. I can select and overwrite the current value, but I can't delete the current value and type in a new one. It's easy to work around, but counter-intuitive.
Enable Delete in Drawing Preferences->Grid
Re: Enable Delete in Drawing Preferences->Grid
Bug fix. There are a few input boxes that need attention - like the opacity in fills...