@PapadakisI'd assume unlocking a vehicle while handcuffed for an officer after rp is also unrealistic? But people need to be cooperative OOCly to make rp fun. The /Dice command has been used over the years to fairly decide the outcome of the performed rp, and it's completely optional; players ask each other if they want to dice.
The coinflip would be another great chance calculator method, or it can be used for IC decisions better than a dice and @DoubleAhas already provided an example but here's two:
Heads, I'll finish him off. Tails, he lives.
Heads, I'm going to use the Komoda today. Tails, I'm using the Raiden.
etc.
On the other hand, the dice can be used for multi-option decisions.
What I find annoying when it's used in deciding rp is that people rely on it to see if they'd fail or not, without creating a reason of why they would have failed or not, and rather end the rp there. For example, kicking: Vixxey swings her right-leg backwards, then swings it forward at the man's groin. She lost the dice/coinflip and failed. So she adds a reason to why she might've failed, like slipping, etc.
Anyway, +1 from me. It's another good alternative.