Citation count ("cited by ...") besides reference
I think one of the most important functions of a reference software is to help you distinguish between relevant and irrelevant references. What is missing to organize references more efficiently is an indication of relevance, e.g., through an overall citation count for each reference. I know this would be a lot of work to scrape the data somehow from databases such as scopus or google scholar. But I think it would really help to have some indicator on the relevance of a reference. Alternatively maybe it would be helpful if the star evaluation could be shown besides every reference, so that there would be at least a manual workaround to add this additional information.