No the Floor Plan is a Floor Plan...The Room TAG is visible, but the diagonals which allow you access to the ROOM rather than the ROOM TAG are just not visible.
Right onto your second question, when the FLOOR is turned off the diagonals are now visible and editable.
Ah hah, This solves the problem but does not seem right, yes it's a workaround although not ideal. Whats your thoughts on this one? Having to turn off floors every time you want to change an upper floor room ? Hmmm...