Custom filename for ExportAGN?

I am trying to create autogen twice for thee same area from 2 different sources, regular OSM data and the Microsoft Bing building data. I am creating veg, lights, etc with the OSM data and building autogen from the MS data. I would like the ability to specify to ExportAGN a naming scheme to the files. As it is now, many of the files wind up with the same name as I believe it's based on the coordinates used. What I would like to be able to do is have it export the files as BUILDNGxxxxxxx.agn or something like that. Is this possible? would this be possible to implement? Thanks for your help.