Speaking of FinderPop, the new 1.5.1 version includes "a completely rewritten low-level trap patching mechanism in an attempt to get it working in apps other than the Finder. This can work relatively well for non-CMM-aware apps if used in conjunction with Apple's Internet Data Detectors."
However, according to Michael Macrone, the new version still does not fix the documented conflict between FinderPop and QuicKeys 3.5.2r1 in Mac OS 8. At least on his Mac, "the same thing still happens. When I attempt to use any of several contextual menu modules (not the built-in items like Get Info or Labels), my Mac crashes."