That would be cool. I've found it works a little bit already with logs, if you push a log onto the ice then it will break if it can't hold the weight of the log, but then if you try to step onto the ice, it might not be able to hold you+log so it might break anyway.
I tested it just now with throwing 13 stones and 171 lb dead driikilais hunter (it's what i had available, brand new character) and throwing them onto the ice didn't break it, but my sow breaks it and i hear a cracking sound when i (149 lb + 48 lb of items) try to stand on it. I'd want to test it again with ice that's just starting to form and testing stones that should break it but i don't have any characters that are at the right time of year for it