When asking for more information on a question or answer, it's not uncommon to see something along the lines of "Let me just use my crystal ball" or another such remark, to indicate that the person asking the question (which is the more common instance of this) or providing an answer needs to give more information or code because the question or answer simply does not give the information needed, probably skirting around important chunks of code.
Is there a better way to ask for more information? Perhaps a system could be implemented in which a viewing user can "request" more information, users who request more information are displayed on the question or answer as having done so and the user who asked or answered is notified. When the question or answer is updated, everyone who requested more information is notified as well.