Keybow key combinations with more than one key

I have a keybow, and I have it set up with some arrow keys, and then I was thinking of setting up another one of the keys as the meta key (I’m on a mac) so I could do meta+left/right to jump to the beginning or end of the line.

I can’t seem to get a key combination to happen with two key presses though.

To be clear, I don’t want to set ONE key to do meta+left. I want a meta key, and an arrow key as two separate keys, but the ability to press them at the same time.

I tried setting key 3 to do set key left_meta and keybow.key_down, but it doesn’t work in conjunction with another keypress on the keybow.

Is this a limitation of keybow, am I just missing something?