Do not expect Ramos, Moya, Dromm, or the NCOs of the 115th Precinct to respond to "important issues," especially if these issues have to do with crime in the neighborhood. None of them really care. You can expect them to respond for an opportunity to take a feel good photo. That they will do.
If the important issue that you are talking about is ongoing, calling 311 relentlessly is probably the best course of action.