Drag/drop now has a User preset for dragging threshold.
Noticed this was set to 3 pixels even, made it 5 as default.
Tablet owners can put it larger too :)
Note: the tweak-threshold (3d win) is 10 pixels now, I think
this needs another preset too, leave this for now.
Also: fixed crash in filewindow: drag .blend icon and drop it.
You can't test anything in Blender or you get a bug :)