The console "Help" command is a godsend, especially since Bethesda hasn't released the Creation Kit yet.
Use: "help berserker 4" from the console (without the quotes). It shows that the Berserker Rage power is a spell with the id AA026. Use "player.addspell aa026" to get it.
I found that there are two spells for Night Eye: 6b10e and aa01d. Adding either one of them gave me a "night eye for 60 seconds" that I can use repeatedly (not once a day), and you can turn it off by pressing Z again.
One other thing, if you're looking up a string with the help command that contains a space, put double quotes around the string. Single quotes don't work. If the help command doesn't return anything, then you forgot the filter parameter.