Keyboard mavigating through menus

Hi,

I've recently created my own startmenu (see attached image), with hotkey Alt+Win assigned to it. I'm used to navigating by keyboard as much as possible, but now I'm running into two minor problems.

1st: When pressing the first letter of a submenu, I would like the menu to be opened automatically, just like the normal startmenu is working.

2nd: When my mouse is in a place somewhere where the menu expands, it is impossible to navigate by keyboard, because I've set the option to automatically expand when hovering with the mouse. In the attached image one can see the mouse is above "Microsoft Mouse", but when I try to navigate to "Borland C++ Builder 6.0" (by keyboard) the "Microsoft Mouse" menu opens because of the placement of the mouse.
Question: IMHO hovering with the mouse means a (small) movement of the mouse. Is it possible to distinquish between a real movement (hovering) and the static placement of the mousepointer without moving? In the last case, the menus shouldn't be automatically expanded.