[otrs] Custom reports

Hi Has anybody already created reports that show the following information : 1) Number of distinct customers (distinct email addresses) who have created a ticket per queue during the last month ? 2) Average number of messages / threads (answers from agents and followups from customers) per ticket per queue during the last month ? 3) Number of phone-tickets (there is no criteria / field to distinguish email-tickets and phone-tickets in the stat module) created per queue during the last month ? Regards, Sylvain