1.x Intuition knob gadget

[arcanist]

I've created a rotary knob gadget which changes value/image as the mouse moves up/down while clicked. It's a GTYP_BOOLGADGET. GTYP_PROPGADGET seems too specialized for sliders to represent a knob. GTYP_CUSTOMGADGET appears to be reserved for BOOPSI in 2.x.

It almost works perfectly except GACT_RELVERIFY suppresses IDCMP_RAWKEY events while the gadget is pressed. I need to process key events while the knob is being moved to play notes (the knob is part of a synthesizer). Without GACT_RELVERIFY I cannot use GACT_FOLLOWMOUSE, which is a documented exception for GTYP_BOOLGADGET. I could install an input device handler to grab key events at the source but that's messy.

Can this be made to work or would my use case be better implemented by mapping window IDCMP events to logical gadgets in software?