Re: thunders lighting
you can add one attack style to your summon thunder attack array, put the Begin_thunder_lightning animation in it, then add another array to his empty spell array, listed as unknown, best way to find it is trial an error(note it was equal to where your spells list is) create an array since it has none. and then add Thunder_lightning from spells to it, he will only do it rarely but he will do it more often the more he is under attack.
Note: its a good idea to make it so your summon stays out max amount of time, simply edit the summon spell, then when you can tell he is about to do it get away from him because it hurts you when he does, or just use physical shield with an inf Mana trainer. also dont allow him to take the kill because it sometimes replaces him, this really pzzz me off XD... but if it does happen you should be able to load your game and have thunder back, but then this makes him pretty useless in quests... Unless you want to constantly repeat the quest lol
Enjoy Expierimenting with this and Happy Modding!