I don't understand... some "apps," meaning "applications," right?
Are you concerned about the kerning within Finale, or are you concerned about OS X's implementation of kerning with type 1 fonts? OS X most definitely isn't an application -- it's an OS, comprised of a bunch of applications.
If certain applications are exhibiting weird kerning behavior, that's one thing... but if the entire OS (OS X) is exhibiting weird kerning behavior, that's a completely different thing.
Please elaborate.