I'm inclined to agree. Myself, I can't think of many 'advanced' options that would fit within the scope of VaultWiki besides what's already available in the Wiki Code Manager. To me, the 'Advanced' BB-Codes you have suggested are very similar to CMS widgets, and should perhaps be left to the community to develop.
That said, the Parser Extensions probably need to be a little more extensible for custom VARs to work, but at the moment I believe it's already possible to have hard-coded templates with PHP handlers (look for hook vault_bbcode_template in vault/special_class_bbcode.php).
A mod that does this probably needs to add a record to the vault_protect table to make sure the user doesn't try to create a page with the PHP-template's name.