Agreed, this is a needed feature, for both text boxes and upload zones. Here is an example, a sweater with three possible design areas: http://fil.xpressprint.no/z0V0phl .. The user has no idea where they can add design before they click one of the fields. If would also be nice if the line color changed when hovering over the fields, to show which is which.
For upload zones you only need to set a placeholder image with an own graphic, e.g. rectangle with a dotted stroke.
Included in V3.7.2
Toggle in General settings of FPD.