Approval Process Question after Rejecting the WI approval

When a workitem has an approver set on the approvals tab, an email is generated to the approver telling them that they need to approve something. If the approver rejects the work item, an e-mail is then generated to the owner of the request telling them that the requested approval was rejected. If, after that point, the owner fixes the non-compliant areas, the owner has no way to reset the approval request back to Pending. The owner can not edit the state button. Furthermore, unless the approver is also a subscriber of the workitem, there is no way that the approver is made aware that the work product is ready for re-review. As I see it, there are 2 options here.

1) Make sure that, when we assign an approver that that person is also a subsriber of the work item.
2) After the work item is rejected, the owner would remove the approval request and create a new request for the next approval.

Based on this scenario I have 2 questions.

1) Is this your understanding of how this process works? Do I have any other options that I might have thought about?

2) Is there any setting that can be made to automatically make an approver of a work item a subscriber?