Would be good if it was possible to tap on widgets to expand them, a bit like how you can in the quick panel. This would make some smaller interactive widgets more usable straight from the home screen.
As well as this, to switch between stacked widgets, would it be possible to make it so you have to hold down slightly then swipe to change the widget. When swiping between home pages, if a stacked widget takes up most of the space on the homescreen you have to be careful not to switch the widget instead.