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.
The 'Range' in the menu list item element sets which list items at the current level the settings should apply to.
No, the entity browser does not work for component defaults as the entities are content, not config.
Google maps may not be showing if you have not set a Google maps API key.