Grab current tool for ALL tools

[malcooning]

I use FreehandFill shape tool often, and I switch all the time between custom brushes and this tool. But if I want to create custom buttons along the way, i can't do it intuitively as i go because the custom buttons edit menu does not have "Grab current tool" for the FreehandFill. I find it counter intuitive to set parameters manually for a tool that I'm using as a brush.

I'd be happy if you could add the option into the custom button menu.