Here's my use-case. I have a dashboard with a number of regions. You can move widgets between the 'regions'. The regions have tolerance set to "pointer".
I also have a 'toolbox' area that shows new widgets and you can drag a widget from that area onto a region. But I only want these new widgets to be droppable on a region once they are fully clear of the 'toolbox' area.
I tried multiple ways of accomplishing this behavior (fiddling with acceptance, scope, tolerance), but was never able to get the exact behavior I wanted. I finally wrote an accept function on the regions that made sure that new widgets were clear of the 'toolbox' area. Even this didn't work, and I dug in to find out why, whereupon I discovered what I consider a bug.
If you have a suggested workaround or a better way of accomplishing what I want I would be most appreciative. I hope my explanation was clear enough.