2 questions about the mechanics of the game. (Metal Gear Solid 5: The Phantom Pain)

1.How to throw grenades, smoke and flare grenades and shops nearby? well, that is, not much, when I aim, I see the trajectory of a weak throw, but if you quickly press the LMB (do not clamp), then it abruptly changes the trajectory along a strong throw, as if I pressed the button and throws it far, it annoys me already.
2. I noticed there is some kind of GMP network warehouse, and so, is it possible to somehow transform it into a local one? my Internet is very unstable, and quite often crashes and sometimes it does not turn on for a long time, so because of this the game goes offline and the network warehouse becomes inaccessible and my GMPs go into a colossal minus, well, it becomes impossible to play the game like that, they threaten that people will start leaving the base.