you are not a bother at all, this is what the support forums are for.
Did you solve the sidebar issue? If no, could you link your site where you are using contesthopper?
Thank you for the suggestions on customizing the before/after submit. We will implement additional customization options in the next version (contesthopper 0.9.5).
The contest form should not appear in the email.
Double opt-in email is used if you want users to confirm their participation by clicking the link in the email (generally used for email validation).
Confirmation email is just to inform the user he successfully joined the contest and (optionally) tell him what comes next.
If you have any other questions, do not hesitate to post again.