You can navigate to cells with arrow keys, but when you open the column actions popover, navigating those actions with up/down keys no longer work, navigation with tab key works. it would be more user friendly, if up/down keys would work in this context.

Note for anyone that picks this up. It should likely be in addition to tab, not replacing tab.
@snide I'd love to pick this issue up if you don't mind.
Welcome 馃憢 @AceTheCreator. Feel free to work on any open issues! You can read more about how we work with community members in our Contributing wiki.
I'm working on this