Allow certain Users access to certain Pricing Engines

It would be great to assign Permissions to certain Pricing Engines for Users who are managing certain sites. For example, if I have a staff member managing 2 stores, I'd like to allow them permission to edit/create pricing engines just for the stores they're managing, not every engine. Currently, if a user has Permission, they can see/edit every pricing engine, but ideally I'd like to allow access only for the sites they're managing.