@RentAProbe I see, and I am sorry to hear you feel this way about that option. In my opinion, I found it pretty useful in case I want to chill playing on my keyboard only, or if I wanna sit straight using the mouse too.
I am actually glad the devs thought of giving the players a choice they can make and we're not limited. Honestly, not many games allow players to configure much on this side. Most of them are "Ok, Mouse/Keyboard players - you guys use both or only one by default at our choice. Controller players - you have only those to use". Instead of just forcing both mouse/keyboard for the gameplay on PC, they actually thought someone might like to use only the keyboard, for example. Shouldn't we appreciate such thoughts?
I haven't encountered any issue while playing with my mouse, neither when trying 2 others, neither did my friends which own the game. However, I do think it can have an easy solution for the cases in which the DPI is too high/low, if we're willing to give it a try and accept it.
Wishing you a lovely day ahead, and do let me know if you wish to troubleshoot this more! ^_^