Various fixes and changes based on tester feedback

module/applications/roll-dialog.mjs

@@ -68,9 +68,10 @@ export default class OathHammerRollDialog {
     const rollModes = foundry.utils.duplicate(CONFIG.Dice.rollModes)
 
     // Build select option arrays
-    const dvOptions = Array.from({ length: 10 }, (_, i) => {
-      const v = i + 1
-      return { value: v, label: String(v), selected: v === 2 }
+    const dvOptions = Array.from({ length: 11 }, (_, i) => {
+      const v = i  // 0..10
+      const label = v === 0 ? "0 (opposed)" : String(v)
+      return { value: v, label, selected: v === 2 }
     })
 
     const bonusOptions = Array.from({ length: 13 }, (_, i) => {
@@ -130,7 +131,8 @@ export default class OathHammerRollDialog {
           callback: (_event, button) => {
             const out = {}
             for (const el of button.form.elements) {
-              if (el.name) out[el.name] = el.value
+              if (!el.name) continue
+              out[el.name] = el.type === "checkbox" ? String(el.checked) : el.value
             }
             return out
           },
@@ -143,10 +145,11 @@ export default class OathHammerRollDialog {
     const attrOverride = result.attrOverride || defaultAttrKey
 
     return {
-      dv:          Math.max(1, parseInt(result.dv)         || 2),
+      dv:          Math.max(0, parseInt(result.dv)         ?? 2),
       bonus:       parseInt(result.bonus)                  || 0,
       luckSpend:   Math.min(Math.max(0, parseInt(result.luckSpend) || 0), availableLuck),
       supporters:  Math.max(0, parseInt(result.supporters) || 0),
+      explodeOn5:  result.explodeOn5 === "true",
       attrOverride,
       visibility:  result.visibility ?? game.settings.get("core", "rollMode"),
     }