In the DevTools settings, there's a "Shortcuts" section. Found these keyboard shortcuts there:
Toggle drawer
Show console in drawer
Change number by 10
Change number by 100
Toggle "visibility:hidden!important" (useful when debugging page repaint times)
Don't show the yellow dimensions tooltip (useful when the tooltip covers just the area you need to see).
You can actually drag and drop elements around, as well as copy, cut, paste and delete them, either with your mouse or with the common keyboard shortcuts.