Hello, newcomer. Don't mind Kazern's answers.
In SLRR you can't change animations of your driver in-game, with some setting or such. It's set in every car separately, in way modder wants it to be. So, one car may be driven with one hand, another with two hands 🙂
Also - it's always recommended to not use any modpack (like Jack's), but to build your own SLRR using game bases (vanilla 2.2.1MWM or Stage 1 or BB'S SLRR) and mods you choose.