Hello there, i've found a way to roll on boes and make them not become soulbound.
here's how :
1, make your inventory full (divide stacks, etc.)
2, roll need on the item
3,since your inventory is full you cannot receive the item, therefore the item stays on the mob.
4,make some room in your inventory
5,go loot your boe off of the mob
i have tried this in many dungeons.
will be posting picture as soon as my ban gets lifted.