I added scaling to XLoot Group and Monitor, I'm not sure if it's made it into the latest versions. Scale options are most easily accessed right from the anchors for each one. The links to the development versions are at the bottom of the XLoot page here on WoWI:
http://wowace.com/files/XLootMonitor/XLootMonitor.zip
http://wowace.com/files/XLootGroup/XLootGroup.zip