You're welcome!
You're right when You have many furniture at the same elevation but different height.(eg. a dining table and few chairs which are partially under table). If You put the table first and then the chairs these will appear over the table; You must use this procedure:
select the table -> Ctrl+x -> Ctrl+v
=> the table will be shown over the chairs but also, in the furniture list will be moved to the end position.
Indeed it would be great to have the possibility to move up/down the selected furniture in the furniture list.