I find 6 thumb keys is all I need for all day typing. I use home row mods, so Ctrl, Alt, GUI and Shift are all accessed via holding down a home row key. Some f

I find 6 thumb keys is all I need for all day typing. I use home row mods, so Ctrl, Alt, GUI and Shift are all accessed via holding down a home row key. Some folks make do with 4 thumb keys.