I sure do have a habit of making more work for you guys. :D
I have a setup in which I have multiple iCloud accounts. One for myself, and one for my business. If 1Password data is going to be synched with iCloud, which iCloud account is it going to use? It didn't look like it was giving me the opportunity to pick one, so I assume it was using the first. Since it is possible to have multiple iCloud accounts registered on an iOS device, you ought to be able to pick one just like you do for Dropbox. If that's not actually doable (the iCloud sync API is something I've never looked at), it'd probably be a good idea to somehow inform the user which one is being used so they aren't confused about that.
I hope I'm making sense here.