Image Capture, twain sane interface, and Snow Leopard compatibility?

I have downloaded and installed Mattius Ellert's twain sane interface in order to be able to use an old scanner. In order to use it with Image Capture, Ellert's FAQ page describes a procedure for selecting the twain sane interface GUI over the native GUI. However this procedure fails in Snow Leopard; I seem to have no choice but to run the native GUI, with extremely limited functionality. The twain sane interface GUI is still there and still works; it is what comes up if I scan from Microsoft Word or Graphic Convertor. But I would like it to work with Image Capture and related Apple software (preview and the print/fax control panel). Does anyone know of a procedure to do so?

Also does anyone know where this GUI actually lives on the computer? I examined the installed file locations specified in twain-sane interface's bom file, and just found a bunch of .strings and plist files in Image Capture/TWAIN Data Source/Sane.ds/Contents/Resources, plus one file under ....Sne.ds/Contents/MacOS called SANE.