There is a new test kernel available for 2007.0 in .../main/testing
kernel- dated 25-Jan-2007. If you install this kernel and
add "options uhci-hcd rapid_enum=y", no quotes, on the first line in
/etc/modprobe.conf, your 5300C and likely 5370C scanner will now work in
2007.0. This applies only to USB UHCI based systems.

See for details. Hopefully,
this patch will not cause any regressions if you want to give a test kernel
a try and report the results.

UHCI refers to USB1.X, Intel or Via chipset based systems. More reading at