I didn't have any issues with the npc conversation part. And the summon limit is still as it was in vanilla, one summon unless you have the master perk in conjuration so it won't mess up the balance. There's probably a whole lot of mods that would fix that for you though!

hi,
i haven't tried this mod yet, could you tell me if you can summon multiple undead with this one? not only 1/2?
and will i be able to interact with NPCs while i have summoned a zombie? or will they just tell me to go away with that magic? (happened in another mod before). it's pretty annoying to travel through skyrim to search and kill all of your zombies just to end a quest^^