Devel::Cover is going to be my basis for "percentages". in this particular case, trying to achieve 100% coverage may not be practical at all, at least not pre-application release. (i say this *only* because these are single-site modules and not a public-consumption distro. i'm sure i'll add more features and tests later, and can try to come closer to 100% coverage.)
in any case, thanks for some opinions on knowing when to say "enough is enough".