On Math Stack Exchange, you can create a custom filter. That gave me an idea for a feature to add to the filter, and that is the ability to sort by character ranges. You could put in the filter "Give questions ranging from $50-100$ characters" and get very short questions. This is because there are a lot of questions that aren't suitable for this site where the author just put the question down, so the question would obviously be very short. Thus, by adding this filter it will be very easy to locate these types of questions and flag them.
Example questions (edit more in if you have them):