Overriding the blockade WE has, just shift+click/enter gives you nolimit, the spells he was referring to is the language the editor reads them as. Go to the tab that says "View" in your object editor then press Display Values as raw data, now in your left column the spell and item names should have changed, so, from here, you press shift + enter/click to access item abilites on your item then enter THOSE names in there, and you can have unlimited spells, remember to separate each new spell with a comma (,), once again, and example, Amls (Magic Leash) and Aroc (Barrage) would be, Amls,Aroc, in the abilities field of your item. I will give you a step by step list, making it easier for both you and me... because I can't even write properly >.<
Step 1: Press View in Object Editor
Step 2: Press Display Values as Raw Data
Step 3: Go to abilites and choose the spells you want for your item
Step 4: Go to your item on which you want to put the spells
Step 5: Hold down shift and press enter(or doubleclick) on the field that says abilList
Step 6: Enter the spells' names using their raw code (their real names) and seperate the spell names with a comma, e.g Amls,Aroc,Amic,Amil,Adis,Absk,Alsh,Aspl (naming all spells starting with a.......
)
Step 7: Press view and press display values as raw data again so you can see the names again, unless you like it that way
Hope I gave you at least a little help