Thought: The game has weather. If the biomes were left as-is but you could have a "long lasting, map wide weather" where if winter hit, it would be cold in all the biomes (maybe desert is still cold, just not snowing, winter biome is super cold and snowing constantly) and then just cycle through the seasons really slowly?
It might work "ok" in the default navezgane map, but if you had a custom/random map generated and only allowed a few biomes (realizing youd miss the biome specific things) , or "layered" the biomes a little more naturally so snow and desert don't touch (Example: desert only on the south, snowy only to the north, everything else can be in between) it might feel a little more natural if there were a persistent cold-spring-hot-fall cycle. I personally think I'd like the hot/cold regions to be very large so that it would be "something to travel in" when the weather permitted, as you would have a hard time living there.