Dealing with many waypoints brought into overlays from my GPS I need the facility to be able to choose certain ones to maybe delete them or change the icon for the mark etc. It would be good if we could highlight the required marks in the Overlay Objects box and then edit them accordingly.
It is so very time consuming to have to do this with each one individually, especially when you have hundreds on one overlay.
So please, please work out a way that this can be done, as although MM is a wonderful programme, the lack of this facility is a big disadvantage.

Try exporting your overlays as csv files & use a csv editor.

Not much use out in the field of course.