I would've loved something like that. Touches of realism like that always make me happy, so long as it's not overdone to the point of harming playability. This is why I love the sunstroke thing in desert areas in Earthbound, where you can heal it either with PSI Healing or a wet towel. Or in the Shadow of the Colossus, where the horse doesn't ALWAYS respond right away. A little realism can go a long way.
Perhaps there could have been a frostbite status effect...something that Rika probably would have been particularly vulnerable too.
And really, sunstroke trekking across Motavia's deserts would've been another neat addition along these lines.