I believe that extra support options were added for V4 of Kooboo. You now have a number of options.
Each Kooboo 'Site' has a 'System / Settings' page with a 'HTML Meta' section on it. This allows you to define site-wide meta tag values for all the common meta tags, as well as defining some of your own custom tags.

The same level of detail can be achieved on a page-level basis, where these values will be prefixed to the site-level values, allowing you to have titles like: -
You can also use tokens in the settings, that will get replaced with context-relevant values:

You also have a very high level of control over the URL's that Kooboo allows access to. Its default approach is for each piece of content to generate a SEO friendly "user key" that can be used to refer to the content. This User Key can then be used as part of the URL to access the page.

There is also native support for 'Robots.txt' and whilst generating a 'SiteMap.xml' is a little more hands-on, it offers perfect granular control for the developer: http://kooboo-cms.ru/articles/detail/sitemap-for-kooboo-cms/
I'm not yet familiar enough with Orchard to say if it offers the same level of SEO targetting, but I think Kooboo has all the major options nicely covered.