Sorry, too complicated, as that would require a large change to the weather system. Slopes in addition to piling up snow wouldn't be simple. There are footprint particles in the game, but I don't know if they're even used. That might actually done with particles, but everything would be too complicated.
I've been following this topic, the text is still red but I'll fire a request anyways since I'm gonna be out of town for the next week.
Since the new saturation mechanic that heals your health super fast if your hunger is full and you have saturation, I've been longing for a mod that balanced regen.
As of now there's no proper passive regen mod for 10.0.2.
What I want is a way to remove the extra regeneration added by the saturation, but still have a slow constant regeneration, even if your hunger bar isn't totally full, but getting slower as the bar empties.
An easy way to implement this would be making a mod that simply adds this "scaling regen" based on the hunger bar, then the player has the option to turn off the naturalRegeneration gamerule in order to not get the extra saturation/full hunger healing. The mod could be called "unnatural regeneration" and of course, should work even with naturalRegeneration turned off.
Hm, could be done. Text is still red because I'm busy with other things, which is why I haven't done anything with this workshop or my others mods. I actually really like the 1.11 hunger/regeneration system, and I may try to make a mod that does that. I can try to do your request, though I haven't really done anything similar, but it seems simple enough. Don't expect any success, though.