Feather - I would like it back.
Elemental Shields - Would be cool to have back, never really used it though. Fire, Lightning, & Ice wards would be useless though, as Wards already block all of those.
Open - Would be nice, I suppose just have the level of unlock scale on Alteration skill rank. Lydia can open Master locks though, so...
Water Walking - Would be nice, though I never use it. It would make completely ruin any monsters near water though.
Bound Armors - I would like them back, though I never used them. Would be an alternative to picking the Mage Armor perk I suppose.
Other Bound Weapons - Would be good so people can use other types of weapons so things like the mace perks would work with it.
Skeletons & Zombie summoning - With Necromancy as they are now, it wouldn't work. I feel like Necromancies should have longer durations regardless though, since you need a body to cast them.
Ghost summoning - Yes, I would like it back. Ghosts would make more sense to summon then skeletons.
More Daedra summons - Of course.
Damage Health, Stamina, Magicka - Sure. Not sure if it should cost more than elemental spells because they wouldn't be resisted based on enemies, or less because they don't have alt effects.
Disintegrate - Wouldn't work with no durability. If it weakened their weapons or armor temporarily like how Marked for Death does armor, then yes.
Drain - No.
Weakness - Maybe. No weakness to Magicka though.
Chameleon - mmm idk. If it was capped at 50% or something, maybe.
Command - Maybe. Would prolly be a very high level spell though.
Night Eye - I would like it, though idk how you can trick your mind into seeing better.
Silence - No.
Dispel - Perhaps. It wouldn't work on Daedra (banish does that), though it may work on undead.
Reflect Spell - If it was a weaker version of Ward that bounced attacks back, then sure.
Spell Absorption - Meh, Alt perks already do that. Wards can too.
Absorb - (are there spells for these? If not, yea.)
Cure Disease - Yes. High rank though.
Fortify - Prolly not.
Levitate - Not unless was limited to a few feet to avoide floor traps or go across same-level gaps. No flying around.
Mark & Recall - If I am correct, you could place the Mark anywhere then teleport back to it? Then no, unless the mark gets deleted upon entering a new area. No leaving zones with it.
Jump - In reason. No super leaping.
Slowfall - Would be ok.