The LDS have microfilms of Limerick Gaol records until 1901 and the Limerick Petty Sessions records as well until about 1920. It will probably be very time-consuming going through both. I understand that the Limerick Leader and Limerick Chronicle newspaper archives may be coming online in 2012 on the Irish Newspaper Archive website and will be searchable. This will obviously cut the time needed for research. From my own research, both newspapers carried detailed reports of Petty Sessions and other court sittings in Limerick. Good luck with your research!