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 don’t have to add units unless you want to use a specific unit or you’re adding Custom CSS properties.
Google maps may not be showing if you have not set a Google maps API key.
Yes, this is possible by creating a custom element.