[laymil]

Could you explain what you mean by "this keyboard puts heavy emphasis to press modifier keys (enter, ctrl, alt, etc) with the thumb?" I'm sitting here with one in front of me and can't figure out how I would possibly hit anything in your list other than the 'enter' key with my thumb.

[lvillani]

I'm sorry, memory failed me and I included more keys in the listing.

Anyway, having to hit the enter and backspace keys with the thumb is what I found problematic, that's why I remapped them to alternative places with their online tool.