Of course we care about third-party plugins. We went to lengths to release the addon SDK early on in the public beta so developers could get a head start. In this case
R0J0hound is pretty much spot on. Some features are quick hacks for single features. In the case of the Function plugin fast-triggers have some pretty bizarre limitations because they're designed for exactly one use case. Rather than fix the limitations or document them, they're just undocumented and not intended for any third-party use. We're a small company perpetually pushed for time with many users demanding various bug fixes or new features all the time, and it could take 3-4x as long to flesh out a quick hack in to a proper fully-documented general-purpose feature. There's no clear reason to do that and even if there was, it'd have to be a really good reason to justify prioritising it above something else, like working on the new C3 runtime, fixing C2/C3 bugs, etc.