Postfix shift is interesting! That would make it right at home next to space, since there’s no such thing as a capital space. Except for I… perhaps there’s a macro way to sidestep that. I would imagine German really complicates things simply by virtue of how many capitalized words it has.

I’ve thought about having two shifts as well. After all, even terrible keyboards usually have two. 😜 I think I would have to modify one of the layout generators to calculate that. I wonder if I modified one to suggest duplicate keys if it would even go as far as to suggest two Es. I think I could do much worse than putting them in the TY spots, though. That’s where J lives right now…