1. Easiest way would be to use a 1x1 pixel transparent image as your logo. This makes those links centered automatically; that's the way we do it at UBBDev... You lose a logo image, but you can always add one back in via the Header field if you want.
2. What page are you talking about?
3. Look in public_forum_summary.pl in your Templates folder. Remove the two columns for those sections (one will be for the table header, one will be for the main row). Anything you want to do to the main forums homepage will be done in public_forum_summary.pl.
3A. Category view only displays categories. Not the forums within those categories. And it doesn't have the on/off bulbs either. So nope, that's prolly not the way to go.
4. That's in public_forum_page.pl. Again, remove both instances of the column - header row and main row.
5. What graphic? I didn't know there was a graphic for the Hop to menu... ??
Hope this helps.
---Skorpion