Just as a recap so we are all on the same page, in Morrowind staffs were basically just blunt weapons that could carry large enchantments, and Oblivion is was a similar deal; spell launchers with the magical ammunition. Like I said, both of those have always puzzled me. They never really seemed that useful, or even fun to use for that matter. In Morrowind it was just a glorified blunt weapon, and in Oblivion is basically hampered the reasons to put training into your magic skills, as you could essentially get the staff to do your work for you by putting in one destruction enchantment.
The idea Im proposing is that Staffs become their own class of weapon (with its own skill) and rather than being spell launchers or spell holder, they become spell amplifiers. You select one of your own spells as you normally would, and you can use the staff to cast it. The staff could have its own mana, and whatever spells you cast drain the staffs mana instead of your own. As you go up in tier for the particular staffs, they could hold larger mana reserves, and offer a higher amplification base; and likewise, depending on how many points you have in your staff skill, it would modify the efficiency of staff use. So somebody with 0 skill in staffs would quickly drain the mana reserves and would get very little effect amplification, whereas somebody with 100 staff skill would be able to shoot around high powered spells with better mana efficiency.
It seems like this sort of system would better benefit mage characters, while so adding more specialization and use to the class of character itself. Instead of hunting around for regular weapons and enchanting them, it make more sense for mages to find and purchase more powerful and expensive staffs, or even enchant their own with specific base modifiers. To further enhance the idea, certain staffs could be geared towards certain schools of magic to propagate the idea of magic specialization.
The downsides of using these theoretical staffs would be that you`d need to spend a lot of time putting training into the stave skill, and during combat they'd be slower to cast spells than doing it by hand.
Just throwing the idea out there.. dont know if anybody would agree, or if any devs will even take notice of the idea