i don't know where you got the impression. if anything it's the other way round, no?
Of course this requires that you have it installed beforehand, otherwise just download the files manually and edit install.rdf before installing it.
> Literally all you have to do to make it work (usually) is vim ~/.mozilla/firefox/yourprofile/extensions/whatever.xpi, then type /install.rdf, hit enter twice, edit <em:maxVersion>n</em:maxVersion> to be +1, then hit :x and you're done.
Can you (or anyone else) explain why the developers hesitate to fix this problem officially? Like you said, it is rather simple to fix.
Even though most of us on HN are able to apply the fix ourselves, integrating the fix to the official pentadactyl extension would save time for everyone that wants to try or install pentadactyl.
Which seems to mean that you can't run the stable version of pentadactyl on Firefox 27 (the current release) [1]. I do understand that it is not equal to being inactive, but at least for me it was one of the reasons why I returned back to vimperator (which has a stable version that works for Firefox 27).
[1]: https://addons.mozilla.org/en-US/firefox/addon/pentadactyl/