I'd love to see following mods.
-Guild restrictions
Like The college of mages actually requiring the student candidate to be trained in magical arts. It is supposed to be the advanced school of magic for full time mages. There should proper tests before admission, some kind of entry exam. I also think that they let you progress too fast in guild. I'd have loved to see more actual learning quests before they sent to you dungeons etc.
-More lively winterhold and mages college.
I understand why the place is meant to be in ruins and a mere shadow of it's former glory, but this would be a wonderfull quest opportunity..to actually to rebuild the town of winterhold and Mages' College to it's former status. More students, more citizens. Traders, inns etc. I think already saw some guy explaining on his youtube video how he is going to "fix" winterhold. I'm eager to see his vision come true. He had great ideas how to make the place feel more important
-Armored hoods / better looking helmets
I just love how my character looks visually while wearing a hood and light armour, yet the game doesn't really support this playing style, because all the armour bonuses are only applied if you wear helmet.. This needs to be fixed
-More spells
Destruction school in particular needs more variety. For example:
Damage health/stamina/magica spells
Drain mana, health, stamina spells
Weaken armour, weapons spells
I guess same can be said about other schools too. Restoration schools for instance cries more spell variety.
-Armour and weapon repair
I miss this aspect from previous games. It made the whole smithing skilll feel more worthwhile plus it felt more realistic that weapons and armour corroded in use. Just imagine what all snow and ice does to iron armour if you don't oil it reqularely.