Not really, it is a good request! From this app developer's perspective the primary issue is more that it is in a blurry state between being a document option, an application option, and an export option: I don't want users to turn it off globally when it probably would be of significant benefit (you'll not believe the load times that many documents had from dragging in large photos) but also don't want the next-stage annoyance of having to check it for every document or for export slices.
Regardless, this has been thought of a lot and there is currently app-level "support" for it but no UI (in so much this is technically unsupported and may change!). You can fire up the /Applications/Utilities/Terminal.app and enter this command:
defaults write com.tumult.Hype4 newResourcesAreSetToAutoResize -bool NO
As the name implies this is only for newly added resources; existing ones must still be unchecked.