Hi,
Super Mods will be here in 7.3 - I think Rick said he was upgrading here this week.
As version 7 was virtually a new product, that is why the data had to be imported, as a result headers and footers had to be re-input. Any future upgrades should not have this issue, and should be fairly painless and hopefully seamless.
Forum URL's likewise should not alter, although you may have slight changes to allow more search engines to pick up the data and list them. (but this will remain optional)
Sub-forums are already here - so not sure what you mean by 'sub-forum add-on'
I think you should also find 7.3 faster - whilst features get added, code is also streamlined so that should benefit larger sites.
Hopefully your dream will quickly become reality
