You do realize that all wayfinder does is give you dynamic lists with template tags as you deem fit?
I would suggest you look towards your java script or whatever is ’driving’ your menus. ( I myself use CSS only menus, based mostly on CSSplay.
He has examples which have ’padding’ (for lack of a better word) around one of his menus that allow the mouse to trail x pixels off of the menu before the menu will contract. This is likely something you are looking for, and I believe center’s around the mouse-hover event.
However, if you are indeed using Java or flash, or some other form of dynamic menus, I’m afraid it is up to that particular development platform’s capabilities to allow for such functionality.
None of which you provided as information above.
~Aerious