In the case I referred to just above, I eventually sent a second email, and then a few weeks later, I got an email from PBase that the Canon PowerShot G15 had been added. The script that reads the G15 from the EXIF seems to get confused, but at least the G15 is now on the camera list so it may be added manually.
In theory requests should be directed to cameras@pbase.com as there is no guarantee the staff monitors these forums with any regularity.
DaveT