[bombela]

For the Linux crowd what's your custom mapping?

For me its capslock as ctrl, super (windows key) for window management, altgr for layers, right side ctrl as compose key.

[SSLy]

I have caps as control on Linux and Windows (on macOS it's command instead), rest is good choices.

[em-bee]

i have caps as compose. i like to have both alt and control keys to work the same way as it was always the case on US keyboards.