Just for laugh: Total count of turns spent playing DoomRL ever along with Doom-time equivalent (Not sure if this wouldn't eventually wrap around after sufficient number of plays though)
Well I for one can hardly see why this would happen... Since ten turns = 1 second, the computer should be able to take any number of turns and convert them into hours, minutes and seconds...
As for the "kills made with uniques" idea, one could simply combine this with "list of uniques found" so that it gets set up like this...
Unique name: Blaster ??? Phaseshift boots
Times found: 1 ??? 2
Total kills with this item: 83 ??? N/A
Former human kills: 51 ??? N/A
Former sergeant kills: 26 ??? N/A
And so on... Note that the questions marks (obviously) would represent a unique that the player hasn't found yet...