In qpxtool-0.6.1, several binaries (qpxtool, pxcontrol, pxfw, pioquiet) are installed setUID. I suppose that it is insecure to do this by default (because qpxtool is still in beta stage and apparently contains security-related bugs). I would suggest to install binaries setuid only if 'suid' USE-flag is set.
Yeah, it certainly would... except that those tools won't work properly after you've done it, because these tools require low-level hardware accesss. But it will be very secure. ;)