* Wiki-style editing of some kind, along with collaboration tooling, and users can annotate particular pieces of information within an answer.

* Ability to combine/collaborate on multiple answers, such as beginning with introductory information relevant to all the answers, then having some kind of sectioning for specific information for each version.

Two small steps can help toward this:

* Mark an answer as applicable to a specific version number, or range, or date, or implementation.

* Enable the question author to accept an additional new answer that is more current, without subtracting points from the original answer.