Change/Customize Tool Color for Contrast

Hello,

I'm using heal layer for dust spot removal. Mainly dust removal using Paul Reiffer's 'dust highlight' layer.

I have grey skies & a grey tone heal tool color. I would like to change the heal tool's circle to red, or blue or yellow to make it easier to see against the background.

Is this possible, did I miss it when I searched the online documentation?

Thank You

Tom Gerds

Central Minnesota.