network connectivity is a huge issue indeed when designing around vcloud director networking, that's why I found a way already for some service providers I follow to hide the Items tab. I'm not willing to post it here as it requires some unsupported activity, but I'll be happy to share via mail (luca at veeam domain name). I honestly see the reason to hide the items tab, but not the files tab, as this one can be used either for in-place restores (for windows) or just download and re-upload (for linux).
PS: you may want to post these questions in our dedicated service provider sub-forum, you can apply to it via the user management, if you haven't done already.
EMEA Cloud Architect @ Veeam Software
Veeam VMCE #1