Hey, I was thinking about making the file extensions per media type configurable when the request to include vdr files came up. As this is the second request of the same type in a short while I'll do it.
You'll be able to add extensions in the PMS.config file and if the files work correctly you can give us a note to include the extension in pms by default. I'll post more details when it's done (definitely not this week)
If you always wanted to have your most recent videos at the top of the folder in the ps3 or wished you could group all videos with the same genre in one folder, have a look at pms-mlx