Hi, added to feature request list. This feature is a little bit complicated. It dramatically changes the database structure and cause slowing down of running the extension. When there is relationship between map: one map can have more markers, database handling is very easy, but when there is maps can have different markers and markers can be set in different maps, then the database handling gets complicated sql queries which then cause not simple and fast running of the extensions. This feature is still under review, really hard to decide if making the running of program more complicated should be the right way
Anyway thank you for the idea.
Jan