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I'd like to revisit this.
I propose we add a Puzzler tag.
This tag is intended for use when the original poster knows the answer to the question being posted, but chooses not to self-answer, "for the purpose of generating helpful or interesting answers". 1 For the purpose of brevity I propose to call this type of question Puzzlers.
The tag is not ...
"Best book ever about the relativistic rocket equation?" might be closed as asking for answers that are primarily opinion based, but if you give an example or two of the types of questions you are thinking about or somehow indicate the desired scope, and then ask for literature in which the answers are likely to be found I'm pretty sure it will be fine.