This works for JK2, and since the log files are essentially the same for JA, it should work as well:
It makes very nice nice stat pages. If you right-click on a name you can see who their favorite victims were.
/map_restart (directly in the server's console) or /rcon map_restart (using remote console) restarts the map. Adding a number (/rcon map_restart 45) gives a countdown (like warmup) for that many seconds before the map restarts.