AvoidBreak means never.

src/api/java/baritone/api/Settings.java

@@ -200,6 +200,11 @@ public final class Settings {
             Blocks.WALL_SIGN
     )));
 
+    /**
+     * make {@link #blocksToAvoidBreaking} mean the block is never broken instead of just <i>strongly</i> discouraging it.
+     */
+    public final Setting<Boolean> avoidBreakingMeansNever = new Setting(false);
+
     /**
      * A list of blocks to be treated as if they're air.
      * <p>

src/main/java/baritone/utils/ToolSet.java

@@ -165,7 +165,7 @@ public class ToolSet {
     }
 
     private double avoidanceMultiplier(Block b) {
-        return Baritone.settings().blocksToAvoidBreaking.value.contains(b) ? 0.1 : 1;
+        return Baritone.settings().blocksToAvoidBreaking.value.contains(b) ? Baritone.settings().avoidBreakingMeansNever.value ? 0 : 0.1 : 1;
     }
 
     /**