Option 1: We encourage requests for lists. Biblical Hermeneutics might become a poor man's Logos in time, and the site could serve as a Q+A GramCord. However, I'm not so sure I'm interested in taking the time to make it such, and you start to cross the line into theology quickly with lists.
Option 2: We accept only requests for lists when they are narrow in scope. If the asker has taken the time and expertise to have a very specific listing problem that would not be easily available via software like Bibleworks/Logos, then we welcome the question (though you might need a bounty to get someone to do the research for you :-).
Option 3: We don't take listing requests at all. If someone wants to get a list, they are told that such questions are not allowed. Perhaps the question could be rephrased to ask, "what is the closest OT/NT parallel(s) to this construction/idea?" Perhaps the answer would still be a list, but it would not need to be exhaustive (and exhausting).