On my 2019 Ranger I hardwired a Whelen flasher into the tail lights and it worked nicely. From what I'm aware, it can't be done through Forscan. You'll need a flasher.
I just got a 2024 Lightning that came with BC 1.4. Overall it’s been great, I’m on a 3 month trial. I do notice when approaching a highway exit it’ll tend to veer off slightly into that direction then correct itself when the solid line resumes again.