LUKS Encryption Multiple Disk Keys

I would like to suggest the ability to use different encryption keys for the disks in the array. The methodology here is that one key, means someone can decrypt all the data if one key is compromised. If there are different keys for each disk, it would require compromise of each key to get each data disk. It's a secondary level or protection that can be easily implemented in most cases. I think the difficulty is just presenting the options in the console/interface.