ADOM is one of the few roguelikes I wish had permanent saves. Not permanent saves at any given time but like... something like Ragnarok. One save every couple hundred turns, and NEVER in a dungeon. And this would be fairly balanced because of how chaos mutations work, so you couldn't just chillax in town till you could save again.
Um... if I was on a desert island, probably an MMO so that if I could find some wifi access I could contact someone for help.