I want to stop FireBalls from bouncing and rolling down mountains.  Tried ensuring that the collider material has 'bounciness' of zero, but they still bounce.  Anything else I can do?

I think they spent a lot of time making this physics... it was in one of the "Rust" update commits on thier  site  if I remember.
https://rust.facepunch.com/commits/1
There might be something related to a  "class" area you can  decompile  to take a look...

I did decompile the FireBall.  It changes from moving to stationary based on its speed.  So any FireBall set to move fast, or one that gathers a lot of speed from falling, will keep bouncing and move a long way.  I can manually stop it from moving, but ideally I would like the game and/or phsyics system to stop it for me.

Merged post

I figured out a way to get 'er done.  First I added some drag to slow the FireBall down.  But it made it fall stupidly slow when it was in the air.  So I added some fake gravity to pull it down.  Then added even more drag to counteract the fake gravity.  Now I can light the sides of mountains and hills on fire.