Player’s and Gamemaster’s Guides

Some more question that I hope they have an answer to:

Injuries (GM Guide 213-215):
-How do you combine these rules with some of the hostile enviroment rules (Science Division book pg 105-108). Do they all do lethal damage instead of nonlethal? The reason I ask is that many of there rules cause non-lethal damage at first. Using the original rules a character can always Avoid an Injury, and they can continue to act by taking a complication. This option is not present for the optional Injuries rules in the GM guide, even stronger the character is defeated when gaining 1 non-lethal injury.
-Falling rules (GM Guide 203). When combining these rules with the Injuries variant a character can fall from great hights and still survive and walk away (max 2 injuries). In reality there is no chance that they would walk away. If you use a formula called “lethal doses” to determine the likelihood of death in a fall. At four stories, or about 15m above the ground, half will survive. But at*seven stories or 25m, only 10 percent are expected to live – that is, 90 percent will die. So would’nt it be best to add the Intense stress effect from falls greater than Close range? And is there a way to lower the damage with a successful Task as a free action (Difficulty 1 Daring or Fitness + Security, Success = 1 resistance to the falling damage + 1 extra resistance per momentum spent).
-How does the Tough talent work with these rules?

Fatigue (GM Guide pg 213, Science Division pg 106):
In these rules they say that charcters can fatigue from intense heat, extreme cold. But in the science devision book on pg 105 under the temperature rules they say that it does lethal damage. So does Extreme cold or Heat cause both fatigue and regular lethal damage or do you choose?

Tactical movement (GM guide pg 218-219):
-How would you handle a reach weapon using these rules?
-Stronger characters can thow object much farther away. So can you use a characters fitness (double or half with the apropiriate trait) to determine the distance throwed ( grenades and knifes nr of meters equal to fitness and a spear 2 times the fitness??)?