diff --git a/modules/luci-base/htdocs/luci-static/resources/form.js b/modules/luci-base/htdocs/luci-static/resources/form.js
index e1fc3ff3e9dd..2d0304003cd7 100644
--- a/modules/luci-base/htdocs/luci-static/resources/form.js
+++ b/modules/luci-base/htdocs/luci-static/resources/form.js
@@ -3863,6 +3863,17 @@ const CBIValue = CBIAbstractValue.extend(/** @lends LuCI.form.Value.prototype */
 const CBIDynamicList = CBIValue.extend(/** @lends LuCI.form.DynamicList.prototype */ {
 	__name__: 'CBI.DynamicList',
 
+	/**
+	 * Allows the underlying form controls to have multiple identical values.
+	 *
+	 * Default is `null`. If `true`, the underlying form value will
+	 * not be checked for duplication.
+	 *
+	 * @name LuCI.form.DynamicList.prototype#allowduplicates
+	 * @type boolean
+	 * @default null
+	 */
+
 	/** @private */
 	renderWidget(section_id, option_index, cfgvalue) {
 		const value = (cfgvalue != null) ? cfgvalue : this.default;
@@ -3872,6 +3883,7 @@ const CBIDynamicList = CBIValue.extend(/** @lends LuCI.form.DynamicList.prototyp
 		const widget = new ui.DynamicList(items, choices, {
 			id: this.cbid(section_id),
 			sort: this.keylist,
+			allowduplicates: this.allowduplicates,
 			optional: this.optional || this.rmempty,
 			datatype: this.datatype,
 			placeholder: this.placeholder,
diff --git a/modules/luci-base/htdocs/luci-static/resources/ui.js b/modules/luci-base/htdocs/luci-static/resources/ui.js
index 391d64a35449..1dc5ee15bfe7 100644
--- a/modules/luci-base/htdocs/luci-static/resources/ui.js
+++ b/modules/luci-base/htdocs/luci-static/resources/ui.js
@@ -2424,7 +2424,7 @@ const UIDynamicList = UIElement.extend(/** @lends LuCI.ui.DynamicList.prototype
 				exists = true;
 		});
 
-		if (!exists) {
+		if (this.options.allowduplicates || !exists) {
 			const ai = dl.querySelector('.add-item');
 			ai.parentNode.insertBefore(new_item, ai);
 		}
@@ -2505,7 +2505,8 @@ const UIDynamicList = UIElement.extend(/** @lends LuCI.ui.DynamicList.prototype
 			return;
 
 		sbIn.setValues(sbEl, null);
-		sbVal.element.setAttribute('unselectable', '');
+		if (!this.options.allowduplicates)
+			sbVal.element.setAttribute('unselectable', '');
 
 		if (sbVal.element.hasAttribute('created')) {
 			sbVal.element.removeAttribute('created');