P: UI Locking While Masking

I've been using Lightroom since the first version and this has always been an issue. when you're masking around the edges, it's way to easy for the cursor to open or extend a side/top/bottom bar. While the Adjustment Brush pallette is open or while you're actively clicking/dragging/using the brush tool, having the UI lock would be ideal to prevent accidently clicking things and having a bar randomly open.