Add map row to top or left side

When constructing a setup for a game, it would be very handy to be able to add a new board row at the top instead of only at the bottom, similarly add a new board column at the left instead of only at the right. Additional blank Filler boards have become available and I would like to add these spacer boards at the top or at the left of an existing board set but the options do no seem to be available. Currently, I must rebuild the setups from scratch and this may take many hours for a single setup because of the complexity of the counter information so I am unwilling to retrofit existing setups.