A: Yes. When it's raining or snowing the ball is harder to control and the chance of injury is higher.
A: When you click the "Live text" option you can see the game as it is unfolding (or unfolded if you are browsing through old games). In the top of the live-text you have the home and away team tactics plus the first eleven. The tactics picture doesn't show you the exact position for the players. It does however show their relative positions, meaning, GK, SW, FBL, DC, FBR, WBL, WBR, DMC, ML, MC, MR, AML, AMC, AMR, SC, LW, FC and RW.
A: Yes, the AI will do that automatically - unless you don't have any substitutions left, in which case you
couldn't do anything either.