Hi, Ennis.
There’s not currently a setting to be able to assign all events from a specific import source as Featured Events (like you can assign them to a specific Event Category).
You could request this as a new feature (or maybe search to see if the idea was already posted by someone else) at our plugins’ UserVoice page.
This allows others who are interested in that feature to easily voice their support. We frequently review suggestions there to find out which ones are popular, then we implement as many of them as we can.
If you post it / find it, feel free to link to it from here in case anyone comes across this forum thread in the future.