I don't see why this shouldn't be done. In fact, it makes a lot of sense for all platforms. Create a third party mechanism by which users/admins can patch Zero day/unpatched flaws that relies on a community effort to provide the patches. Simple. Except it really needs the support of the OS vendor, because at some point, when the vendor releases the patch, you'd want to be able to "turn off" the temporary one. You'd also need an agreed upon "Master List" of vulns, for tracking purposes.
You'd think that this kind of hand-in-hand cooperation would be a no-brainer, but I doubt it. Companies (here's looking right at Apple) still just haven't wrapped their heads around the open exchange of ideas; they are afraid that admitting flaws makes them -look- bad. Ewwww, poor coders. But in reality I think everyone who uses computers by this point in time KNOWS flaws happen...it isn't that they will happen, it has become what are you gonna do about it? And it is pure arrogance by the OS vendors to think that neither the community has the ability to create these patchs nor that the users/admins are interested in them.
Really this is a thing that OS vendors should aspire to, integrating this kind of response mechanism into their existing Software Update suite would be a Good Thing.
