Thank you for your input.
Just updated the feature request table, including yours.https://drive.google.com/open?id=1RKc_72uKgieBTzYpQLFaU8qVGX63CRKrTPd3iB8zhc8
We're now focusing on HW development, Audio Performance, RF, power consumption, and others.
The initial version of the FW and the app might support some or none of them, but we'll try the best step by step.
About the button mapping, we're considering designing soft buttons, which mapped to any functionality shortcut, like keyboard shortcut preference in PC OS.