Hi, Wyatt G.
Using compare points will almost get you what you want: Damage: [[ 1d10>4f1 * 2 + 2 ]]
Here's what this does: Roll of 1 ⇒ Damage: 0 2 to 3 ⇒ 2 4 to 9 ⇒ 4 10 ⇒ Also displays as Damage: 4, but the green roll highlighting indicates that you should instead use 20 damage. :) Gold's Rollable Table suggestion below is definitely the best way to do this, since the above doesn't quite work. I recommend it! (But note that Rollable Tables don't support roll highlighting or 3D dice.) There's another (non-Rollable Table) method to make it display 20 damage on a roll
of 10, but it's requires the use of a large amount of rounding
functions and is consequently not very easy on the eyes (and possibly
the dice engine, too). Not recommended. :)