If the objective is to use it in a drive-by, the shooter likely would not be able to shoot a service pistol accurately either.
One thing that is done with such pistols is to use a sling, like below:
https://www.youtube.com/watch?v=i2RrjOz2C8U
Instead of pulling a stock into your shoulder, you push the pistol out to let the sling steady it. You also use a holographic sight.
Yeah, the sling could help steady it.