Do I have to use IMCE?
No. Acquia Cohesion allows the site builder to select, either use of IMCE or Entity browser for browsing and selecting images.
Acquia Cohesion renames to Site Studio from version 6.2. Tell me more.
You can only add combinators to child selectors. Add a child selector and combinator will appear in the Style tree.
HTML is escaped when using Drupal tokens in Site studio as a security measure, this follows Drupal core.
You don't. You apply a Descendant selector. These use a (Space).
Not yet. The Style builder does not have the option to add an animation name or key frames. This is planned functionality on our road map.