Edit > Preferences > Tools > Snap Vector Tools and Transforms to Pixel Grid.
Is this possible? If not, I’d like to ask for this to be a feature in your upcoming releases.
Another thought. It would be really nice if the entry you place in your container is “toogle-able” (Boolean), that you display a check mark within/next to the button. Or even just have the button a lighter color when “ON” and darker/normal when “OFF”.