My answers are based

My answers are based on using a 500s and 7020s with a Gemini image so may not 100% apply to a 7000.

1. Probably not but you may be able to use gotoXX- this is described in the Idiot's Guide- I don't use it so can't describe it much more.
2. There are a few xml based EPGs but they're all pretty rubbish. There may be a picture-in-picture plugin but not sure- might only be available for twin tuner Dreamboxes (haven't tried it).
3. If the image is USB stick based it will probably be stored on the stick.
4. The information will still be on the USB stick.
5. Use a normal CAT5 cable to connect a Dreambox to a router. Crossover is only for connecting a Dreambox to a PC.
6. Never tried it. If you have a hub spare try it and let us know. We like and encourage feedback and particpation.
7. Don't know but if it is it'll either be in the Blue Panel or the Expert Setup pages.

Sorry to be a bit vague but hopefully there'll be enough info to get you started. It's very hard to kill a Dreambox and feel free to post as often as you like