Also added Mousewheel support for zoom, which will be available in new version pending for release shortly.
Mousewheel zoom option will be enabled by default, but can be changed by going to admin -> settings -> controls.mousewheel.
By default, it is set to "zoom", but you can also set it to "none" to disable it, or to "togglethumbs" to use the mousewheel (or trackpad) to toggle between image- and thumbnails mode.
PS! Mousewheel functionality does not currently work for Mac OSX, because this functionality is not integrated into the flash player on mac (for some reason).