BuddyPress.org

I agree. This is a usability issue. You have to navigate the fly out menus with perfect right angles. People naturally mouse in direct diagonal lines… not right angles. The problem is that the BP menus are very lightweight (which is a good thing). They are almost pure CSS. To add in a mouse out delay or allow for diagonal mousing or whatever would require a lot of Javascript I imagine.

Magento has a really interesting solution to this however. They make the fly out menus physically overlap the parent menu by about 50%. Not sure exactly how it works and what JS might be involved… but it works great!