I think I need to abstain from answering on what you should do. There is just too little I know about your situation.

I can add two tidbits though:

1) I would believe that the by far most common arrangement is that all objects are in the dbo schema owned by dbo. And even when people use multiple schemas, all schemas are typically owned by dbo. Thus, having all objects in a non-dbo schema owned by a non-dbo user is uncommon, why it is difficult to talk about standards.

2) As for the name, in the system I work with, we have a very simplistic security model on SQL Server level. We grant EXEC on all stored procedures and SELECT on all tables to a single role. The name of that role, be it production, test or development is "dvp". It is just that - a name. (In case anyone wonders, the application has it's own security model, which controls which UI functions users can access and what they can do in the functions.)