I tried out the PSB (Populate Spell Book) command today (PC only) and made a video of the more interesting ones. You can use stuff like Dragon/animal/developer stuff, as well as things like the light beams from Meridia's quest and Alduin's firestorm! If people are interested I can put up the spell codes for these so that you can add some individually rather than filling your spellbook with useless, broken and unusable stuff.
Looks like alot of them are usable to me. Boy, you sure know how to "jimmy-rig" the game! haha!! Cool stuff though. Can you have the firestorm in actual gameplay? I just started a mage and don't know all the spells, scrolls, etc. It seems looking at you magical inventory all the spells have names I haven't seen before. I assume as I grow my mage, "new" ones will show up.