Development of IBS-Map involved removing a fair amount of logic and functionality from the original source. The resulting user interface of the new IBS-Map was more appealing to me and I was motivated to to restore much of the logic and features that had been removed.
IBS-Map is still a single map file where other map files can be imported and added. With this approach the ability to copy and paste across multiple map files is lost but the user interface is much simpler.
The next step is to re-develop the WordPress map viewer as its own discrete package.