While an expanded temp range might be useful, it wouldn’t be practical.
The batteries would drain incredibly fast in a freezer and they would not be effective. Battery operated Gagets do not like sub-freezing temps. This is why most IoT Freezer Temp Sensors are outside with a wired probe running inside.
There is another current Wishlist request that deals with this as well. To support it, follow the link, Vote at the top, like 
some posts, and add your reply post with ideas and use case description.