Just knowing the address isn't enough IMO.

If it was me:
- I'd message every month saying I want my account back, with as much detail as possible explaining why I'm the owner.

Details include:
- Name registered on the account.
- Email address associated with the account.
- Payment method used to purchase the license.
- Website the license was associated with and provide proof showing that you're the administrator with backend (phpmyadmin) access to the website.
- Ask them to check your current ISP- so they can check to see if it matches with your previous posts (before and after you lost the account).
- Provide them with full details of your real name & address (passport/drivers license as evidence).

^ Those are just some of the things I'd do to get my account back, if I was in the same situation as you.
Total transparency and supply as much evidence as possible.
Additionally, comply with any demands/suggestions they give (I'd doubt they'd demand anything unreasonable).

If I was in their situation (especially since vbulletin just been hacked recently), I'd probably wait 1 year to give you back your account.
Why?
Well in case somebody else claims to be the owner of your account.
If nobody else claims it for a whole year, then it's most likely yours.

I realise this is an old thread, but on the off chance anyone can help, is there a way to make this appear at the bottom of the page below all my forums but above the 'Whats going on?' section?

Rather than signing in with your email address, use your VB account number instead; then you can update your email from the Members area.

Hope that helps.

Can you include user avatar?

Avatars can be added with a small modification to the source/template. However, as I have dropped support for this plugin, I will not be releasing an update to enable this.

is there a way to make the chat viewable to some groups but without them being able to use it? (without that they can write, just view)

Thank's

You could modify the engine to only allow message posting to certain usergroups, yes. Let me know if you need any help enabling this.