I have modified my "browser button" to open MobyExplorer. Actually it works like this if i press and hold the button for about 1-2sec MobyExplorer opens but if i press it just once Mediaplayer opens.
I cant remember what i did to get it like that, i think i have applied some patch. (Good memory, eh)
Feel free to ask if you need any help!

And by the way, i am also very interested in modifying the "shortcut menu".. anyone?