Hi,
Indeed we got some feedback a while back that people wanted to use just "Enter" to add a new line, instead of completing the comments text input. It seemed to make sense at the time, so we changed it in one of the SmartConsole versions.
Following that change, we got a lot of negative feedback by people who like to work mostly with the keyboard and were annoyed by this change. It made it more complicated for them to enter a few words in the comment and complete the action. We decided to revert back to the original behavior.
At the end, it seems to be an issue of preference and habit. Using Shift+Enter to add a new line isn't so uncommon in text editors (for example writing a text message in WhatsApp web), so we chose to leave it with that solution.