Paul,
In a gallery you can select a thumbnail, right-click it and look near the bottom of the list for "go to folder". There might be a way to add it to a toolbar, I just don't do it often enough to bother.
Also, don't drag thumbs from gallery to gallery. Right-click the thumbnail and select "Gallery" then "Add To" or "Move To". These can be added to a toolbar, but I have had inconsistent behavior, gallery list that should drop down is sometimes blank.
When you drag from gallery to gallery, whether you simply drag (to move) or ctrl-drag, (to copy) the gallery manager will save the gallery order before executing the 'drop' part of the move or copy, but won't do this if you use the right-click menu method.
M