I just releaded VueScan 7.2.1 for Windows, Mac OS 8/9/X
and Linux. It can be downloaded from:
What's new in version 7.2.1
* Added support for CCD exposure time on Canon FS4000
(integer from 1 to 6), enabling "Device|Auto exposure"
and "Device|Long exposure pass"
* Improved speed of multi-pass multi-scanning on scanners
with two pass infrared scanning (FS4000 and ScanWit 2740S)
by only doing one infrared pass