The LiDE 100 is a GL847 based scanner, the older LiDE 25/30 used a completely different chip. Hence, there is no 'emulation'. Fortunately, the GL841 is supported by SANE, and there is work ongoing to add support for the later chips. Unfortunately, inexpensive scanners require expensive drivers, so you may have to wait some time :(
allan PS- sane sees all unknown class usb devices as potential scanners, since there (historically) was no scanner class. That is why it sees your reader.
