How should the combination "Single Submission" and "Submission Overrride" work

[M Hoogenboom]

I'm evaluating the "Forms for Confluence" add-on, but can't work out "Single Submission" and "Submission Override". I expect that if I select both, the user should be able to resubmit his original post. But I keep seeing the first entered response. Only when I de-select "Single Submission", I see the next submits from the same user.

I've set:

• Internal Database
• Single Submission: yes
• Submission Override: yes

Confluence 5.10.6, Forms for Confluence: 7.7.7

Other questions:

• Is it possible to raise feature requests?
• Is it possible to let a user vote on an entry of someone else?