Not to meta-effect anyone, but I was curious about the intended user experience and community standards of answers that "don't quite" make it to acceptance.
As a concrete example, here's this question I asked: How can you guarantee that an element shape function is 1 or 0?
The answerer led me to a topic which was definitely the sine qua non for understanding the solution, but I needed to sit down and write out laborious algebra to verify the answerer's claim. I want to include a small portion of that algebra in the accepted answer, but my attempted edit disappeared into the ether, apparently.
Shouldn't the system notify me if an edit has been sitting for a long time or was rejected in this case?
Should I write my own answer even if it strongly depended on the existing answer, similar to http://meta.math.stackexchange.com/questions/18883/how-can-i-improve-another-persons-answer-beyond-the-scope-of-an-edit?
Which answer should I accept if I do add another answer?