I don’t know yet. There are several questions which need to be answered. How does the user configure the grid size? Editor preferences window or something else? Should the fixed grid size only be used when the scene editor uses Orthographic projection and not Perspective? You mention snapping as well. I think this is a separate thing from the grid and should be a separate request. Also, how would the snapping work? How does it work in other editors?
You can share it in the editor channel, or source-code channel. But you don’t really need to share it there too.