Can you add a rebound count to the 'Position Raycast'

[tyFlow]

For something like this it's not as easy as adding a feature to the Position Raycast operator, because you also want to track trajectories, as you say.....otherwise I would simply recommend using the Collision operator with 100% bounce and no friction, with a high speed value on the particles, and then stopping the particles after the first frame.

For what you want (full trajectory tracking) you can use the Script operator, which has Raycast functions built in that can be used for this purpose.