Save original question when using 'Edit question'

Another solution would be to make the support request title and description read-only. Is there a reason to allow editing of them. A support request is really more like a conversation than like a bug report where the description summarizes the bug.

One reason I can think of for letting people edit the support request title and description is to make it easier to find for other people having a similar issue.
That way when people are about to file a new support request, the findSimilar() method would have a better chance to find it.

I added in the dupe how my question was twisted (I had kept the history in Gmail)

I think that saving the original description and providing an "original description" link like bugs have would be a better solution than restricting who can edit question descriptions, not just because of the reason that Diogo Matsubara raises, but for another reason as well: Sometimes people edit their own question descriptions in such a way as to render a pristine original useful. I have seen two subcases of this. On the one hand, people frequently add things to their question descriptions that would have been better provided by posting in the question, and that can make the original question confusing. On the other hand, occasionally people replace the *entire* content of their own question's description with an answer to a request for information, which makes the question extremely difficult or impossible to work on without getting back (or having the asker reconstruct) the original description. This happened recently in a question in which I requested information.