I love this gesture, it makes it so much faster, but I as probably many other people have been using photoshop for a long time before, and in photoshop left to right controls brush size, and up to down controls opacity - exactly opposite from artstudio. So whenever i actually use this gesture in artstudio muscle memory gets all mixed up and it takes me longer to switch.
Is there any chance to add a checkbox in the preferences to switch artstudio default axis for adjusting size and flow, so that it's more similiar to photoshop?