To enable cheat mode, you have to edite a game file, so you should make its copy first. Find the "z.cfg" file in the "daggerfall" directory and open it in your text editor. Then , add the line cheatmode 1 to its end.
Now you can use the following keys:
God mode: press Ctrl + F4 while in a dungeon
Activate all maps: Ctrl + F1
5000 gold: Ctrl + F9
Cycle through quest locations: Left Bracket or Right Bracket
Increase reputation: Minus
Increase stats: Plus