1. As I am a customer and not an employee I don't know the answer to this question but I'm sure someone will let you know for sure.
2. You can install your own IPB and MT. The gallery program should not be a problem either.
3. I have multiple single plans so no problem there.
4. You can contact the Help Desk (link at top of page) for more information on this process but yes, it is possible to do site to site transfer if your currently use cPanel.
5. Sorry again, don't know the answer to this one. One of the other guys should be along to answer.
No need to feel sorry, we've all been there.