To get it to happen, you can use a mapped key on the mouseover of a click bar. That mapped key loads a key map, which has a bunch of other mapped keys which have the hotkeys you want, like mouse middle button, mouse wheel scroll etc.

This kind of thing is covered https://www.youtube.com/watch?v=Mizu6e6BEno and http://isboxer.com/forum/viewtopic.php?f=27&t=6593