yeah either use the system action sort z order by (Variable) or give object a Z height equal to variable divided by a million so it doesn't move but still gets sorted by Z height
edit: how has your post almost 200 views in an hour are you constantly refreshing the page ?
So, variable wise, theoretically if there was say, a group of trees or, walls near each other, would it be possible to make those all change at their own individual times, even if they're connected by a family?