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.
No, you cannot layout forms with Acquia Cohesion.
Yes, you can use Drupal fields in certain parts of Acquia Cohesion.
It depends on the use case. For fields and their field formatters use a 'Field' element, for data without field formatters, use a token.
You can style tables or forms through the use of base or custom styles.
No, the entity browser does not work for component defaults as the entities are content, not config.
No site specific data is stored on the API.