i like the general idea of having the possibility to choose any weather conditions and daytime on a map, but i guess being able to have a vote on each parameter would get a little confusing.
i dont think you should add civilians in RO:HOS, simply because this game "portrays" (oh, yes """""!) the battle of stalingrad and i dont think portraying what happened to the people who were still in the city isn't something to be covered by an fps-game. all "authencitiy"-bs aside.
the only animals, that i think could have an impact on gameplay, should be dead horses and dogs, which give you +5hp if you eat 'em...
i really wonder what we have to expect from ro:hos. some people seem to think of large scale tank battles (judging from most of your suggestions, too). how close to the city did tank engagements take place?