Creating Custom Flag

Custom flag or at least editing the current flags would be more than welcome. We intend to use flags whenever there is some question/topic not formulated well enough to provide solid response, e.g. missing link, … despite having a category template some user just ignore or forget about the guidelines.

re-using the spam flag to something like: missing information and providing a predefined text where the user could learn and augment the initial question would be a great way to move forward. Hopefully gaining better question overall, leading to better answers, and less fed up repliers.

Any thoughts on how to prioritize this up? or some pointer to the code to maybe contribute something back?