Actually, I had the same thought today : http://andorstrail.com/viewtopic.php?f=6&t=4245
For me, there's a trade-off between code cleanness and ease of mapmaking. Map makers who want to replace graphics & map objects in the same area on the same conditions could use a single object. I'm waiting for feedback/comments from people like Ian to decide. But as the BDFL of AT, you can choose once and for all too :smile: