I think a good thing to go with that would be giving players the ability to craft wands, staffs, and rods (possibilily through thaum, otherwise with a new skill). To create one one would need to sacrifice:
-for a wand: 10 scrolls of the spell and a quest item
-for a staff: 20 scrolls of the spell and a harder to find quest item
-for a rod: 500 scrolls of the spell and a even more difficult quest item
-for a heavy rod: 2000 scrolls of the spell and a very very difficult quest item
And the lvl of the resulting wand/rod would be the avgrage (or perhaps the lowest) level of the scroll sacrificed. Also I think some scrolls, such as possibly charging should be disallowed to put in a rod or wand.
There should also be backfires; I think a good backfire would be: upon failing, cast ALL of the scrolls that the player tried to sacrifice. If it's a non attack, then it's just a waste of many scrolls; but if somebody fails when tring to create, lets say... a heavy rod of meteor swarm... then the result would'nt be very pretty

Also, no magic areas could be abused to stop such backfires, so this crafting should be limited to magic allowed areas only (possibly make this a spell rather than a skill)