Skill is the primary factor but it is possible. Running an alternate layout for bumper jumper is personally recommended.
In Game there is no Pause. In the Keep (a menu you can physically walk around to use) I think still has an idle kick. Signing in doesn’t take too long.
I don’t know that it’s saved to Sony’s servers. But it is saved to Fatshark’s servers.
Unlikely that any cosmetic rewards repeat. No way to earn them consequently.