For my own questions, a few old questions, I was active on but am no no longer in a good position to administrate, could there be a way I could indicate this, so the system can perhaps roll a vote for a good person to jointy take control of and credit for the question?
The only thing that the question owner can do that nobody else can is accepting an answer. If you have already done that on your old questions, all is well; if not - it's not a huge problem, there's plenty of un-accepted good answers in the system.
You can of course flag the question and ask a moderator to disassociate the questions from your account, but then they're just completely orphaned with no real gain, and it's manual work for mods or even the site's developers.
You can also flag the questions and ask a moderator to make them Community Wiki, which will make it very easy for others to edit. However, answers to the question become Community Wiki as well, and stop gaining rep for answerers. This may not be what you want.