I've mapped Ctrl to the big middle-lower thumb key on both sides; and Alt to the smaller middle-upper thumb key also on both sides. Space is right thumb rightmo

I've mapped Ctrl to the big middle-lower thumb key on both sides; and Alt to the smaller middle-upper thumb key also on both sides. Space is right thumb rightmost big key, backspace is left thumb leftmost big key. Windows key and Delete are small keys; and do require a bit of a reach of the thumb. But I don't use them much (e.g. for delete, I'll do Ctrl+D). Enter I put in its usual place (i.e. not a thumb key). In Emacs I use Ctrl and Alt more than Enter, Space and Backspace. And I like to press them with opposite hands like shift, hence I have them on both sides. This helps avoid stretching. When exported as a text file from the Advantage2, my mappings look like this: [=]>[`] [tab]>[\] [caps]>[tab] [up]>[down] [down]>[up] [`]>[=] [lalt]>[lwin] [ralt]>[delete] [\]>['] [lctrl]>[lalt] [delete]>[lctrl] [rctrl]>[lalt] [enter]>[rctrl] [']>[enter]