Binding fly pie menus to backspace + modifier

[johron]

The Motivation

I currently have my caps-lock bound as a second backspace and i find it very useful, but I feel that being able to open my fly-pie menu with alt + caps/backspace would be very nice for me.

The Solution

The current use for backspace in keyboard binding can remain, but allow having backspace in addition to a modifier or use a different key such as delete or having a button.

The Alternatives

I've tried changing the binding in the dconf editor, but the fly-pie extention does not recognize or