If I have a panel open, eg. a Properties panel, if I scroll down the panel using my mouse's scroll wheel, it is possible to inadvertently change things in pop-up menus in the panel if I happen to scroll on them. This can happen quitre easily:
1. Move your mouse to an empty part of the properties panel
2. Scroll the scroll wheel to move up (or down)
3. See how if a menu scrolls into position under the mouse pointer, you'll change the values
I suggest this behaviour is fixed so that it's possible to NOT have pop-up menu values changeable with the mouse wheel unless the user has clicked on that value, or some intelligence is coded in to the scrolling process that maybe checks if the window has been scrolled in the past, say 1 second, and during this 1 second disables the mouse-menu-value-changing behaviour.