Comment #7 on issue 432 by google....@ben.coman.com.au: Popup should appear only when a certain modifier key is pressed http://code.google.com/p/moose-technology/issues/detail?id=432
Please keep the current behaviour as default. Having a new #shiftPopup: would be useful. Having two levels of behaviour on hover would be very interesting. Default hover could give a quick simple view, then while hovering looking at that, pushing shift would expand to a greater level of detail.
Also perhaps rather than specifically "#shiftPopup: [some behaviour]" have more generic "#extendedPopup: [some behaviour] on: #XXXX" where #XXXX is #shift or #ctrl of #alt or combination {#shift. #ctrl}