diff --git a/NEWS b/NEWS
index 5a95184a..a986f937 100644
--- a/NEWS
+++ b/NEWS
@@ -8,10 +8,15 @@ Noteworthy changes in version 1.14.0 (unreleased)
  * cpp: The sign key edit-interactor now supports multiple signatures
    from the same key. [#4734]
 
+ * qt: Extended signkeyjob to handle remarks and multiple signatures.
+   [#4734]
+
  * Interface changes relative to the 1.13.1 release:
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  cpp: UserID::remark                          NEW.
  cpp: GpgSignKeyEditInteractor::setDupeOk     NEW.
+ qt: SignKeyJob::setDupeOk                    NEW.
+ qt: SignKeyJob::setRemark                    NEW.
 
 
 Noteworthy changes in version 1.13.1 (2019-06-13)
diff --git a/lang/qt/src/qgpgmesignkeyjob.cpp b/lang/qt/src/qgpgmesignkeyjob.cpp
index 2befe539..7f79cb56 100644
--- a/lang/qt/src/qgpgmesignkeyjob.cpp
+++ b/lang/qt/src/qgpgmesignkeyjob.cpp
@@ -57,14 +57,17 @@ QGpgMESignKeyJob::QGpgMESignKeyJob(Context *context)
       m_checkLevel(0),
       m_exportable(false),
       m_nonRevocable(false),
-      m_started(false)
+      m_started(false),
+      m_dupeOk(false)
 {
     lateInitialization();
 }
 
 QGpgMESignKeyJob::~QGpgMESignKeyJob() {}
 
-static QGpgMESignKeyJob::result_type sign_key(Context *ctx, const Key &key, const std::vector<unsigned int> &uids, unsigned int checkLevel, const Key &signer, unsigned int opts)
+static QGpgMESignKeyJob::result_type sign_key(Context *ctx, const Key &key, const std::vector<unsigned int> &uids,
+                                              unsigned int checkLevel, const Key &signer, unsigned int opts,
+                                              bool dupeOk, const QString &remark)
 {
     QGpgME::QByteArrayDataProvider dp;
     Data data(&dp);
@@ -74,6 +77,15 @@ static QGpgMESignKeyJob::result_type sign_key(Context *ctx, const Key &key, cons
     skei->setCheckLevel(checkLevel);
     skei->setSigningOptions(opts);
 
+    if (dupeOk) {
+        ctx->setFlag("extended-edit", "1");
+        skei->setDupeOk(true);
+    }
+
+    if (!remark.isEmpty()) {
+        ctx->addSignatureNotation("rem@gnupg.org", remark.toUtf8().constData());
+    }
+
     if (!signer.isNull())
         if (const Error err = ctx->addSigningKey(signer)) {
             return std::make_tuple(err, QString(), Error());
@@ -93,7 +105,8 @@ Error QGpgMESignKeyJob::start(const Key &key)
     if (m_exportable) {
         opts |= GpgSignKeyEditInteractor::Exportable;
     }
-    run(std::bind(&sign_key, std::placeholders::_1, key, m_userIDsToSign, m_checkLevel, m_signingKey, opts));
+    run(std::bind(&sign_key, std::placeholders::_1, key, m_userIDsToSign, m_checkLevel, m_signingKey, opts,
+                  m_dupeOk, m_remark));
     m_started = true;
     return Error();
 }
@@ -127,4 +140,16 @@ void QGpgMESignKeyJob::setNonRevocable(bool nonRevocable)
     assert(!m_started);
     m_nonRevocable = nonRevocable;
 }
+
+void QGpgMESignKeyJob::setRemark(const QString &remark)
+{
+    assert(!m_started);
+    m_remark = remark;
+}
+
+void QGpgMESignKeyJob::setDupeOk(bool value)
+{
+    assert(!m_started);
+    m_dupeOk = value;
+}
 #include "qgpgmesignkeyjob.moc"
diff --git a/lang/qt/src/qgpgmesignkeyjob.h b/lang/qt/src/qgpgmesignkeyjob.h
index 3b311913..9c19c02b 100644
--- a/lang/qt/src/qgpgmesignkeyjob.h
+++ b/lang/qt/src/qgpgmesignkeyjob.h
@@ -39,6 +39,8 @@
 
 #include "threadedjobmixin.h"
 
+#include <QString>
+
 #ifdef BUILDING_QGPGME
 # include "key.h"
 #else
@@ -82,6 +84,12 @@ public:
     /* from SignKeyJob */
     void setNonRevocable(bool nonRevocable) Q_DECL_OVERRIDE;
 
+    /* from SignKeyJob */
+    void setRemark(const QString &remark) Q_DECL_OVERRIDE;
+
+    /* from SignKeyJob */
+    void setDupeOk(bool value) Q_DECL_OVERRIDE;
+
 private:
     std::vector<unsigned int> m_userIDsToSign;
     GpgME::Key m_signingKey;
@@ -89,6 +97,8 @@ private:
     bool m_exportable;
     bool m_nonRevocable;
     bool m_started;
+    bool m_dupeOk;
+    QString m_remark;
 };
 }
 
diff --git a/lang/qt/src/signkeyjob.h b/lang/qt/src/signkeyjob.h
index 7a7800dd..e3ae75f7 100644
--- a/lang/qt/src/signkeyjob.h
+++ b/lang/qt/src/signkeyjob.h
@@ -45,6 +45,8 @@ class Error;
 class Key;
 }
 
+class QString;
+
 namespace QGpgME
 {
 
@@ -109,6 +111,22 @@ public:
      */
     virtual void setNonRevocable(bool nonRevocable) = 0;
 
+    /**
+     * Set this if it is ok to overwrite an existing signature. In that
+     * case the context has to have the flag "extended-edit" set to 1 through
+     * Context::setFlag before calling edit.
+     *
+     * Not pure virtual for ABI compatibility.
+     **/
+    virtual void setDupeOk(bool) {};
+
+    /**
+     * Add a remark to the signature. This uses rem@gnupg.org as a notation.
+     *
+     * Not pure virtual for ABI compatibility.
+     **/
+    virtual void setRemark(const QString &) {};
+
 Q_SIGNALS:
     void result(const GpgME::Error &result, const QString &auditLogAsHtml = QString(), const GpgME::Error &auditLogError = GpgME::Error());
 };