No need, as that doesn't fix the Panther issue... Second: PathFinder is shareware, some kind of replacement for the Finder. You can also just use the Finder and let _it_ show you hidden files. Or the Terminal. But: MouseZoom was also mentioned above. The new version can be found here:
http://www.versiontracker.com/dyn/moreinfo/mac/12205 ... (v2.1) and is said to work in 10.3.x, too - unless you've installed a third party mouse driver like USB Overdrive (which you probably haven't). MouseZoom is also free.
However: Do you guys really need accelerated mice? ;-) ... I think that's very windowssy and the bad mouse drivers are part of why I can't really work with Windows. They're too inaccurate, never the right speed... I'm a graphics pro and have to sometimes hit the pixels exactly. ;-)