Right-click on the Q65 mode button to toggle Q65 Pileup mode On/Off.

Configuration.cpp

@@ -997,6 +997,15 @@ void Configuration::set_location (QString const& grid_descriptor)
   m_->dynamic_grid_ = grid_descriptor.trimmed ();
 }
 
+void Configuration::setSpecial_Q65_Pileup()
+{
+  m_->bSpecialOp_=true;
+  m_->ui_->gbSpecialOpActivity->setChecked(m_->bSpecialOp_);
+  m_->ui_->rbQ65pileup->setChecked(true);
+  m_->SelectedActivity_ = static_cast<int> (SpecialOperatingActivity::Q65_PILEUP);
+  m_->write_settings();
+}
+
 void Configuration::setSpecial_Hound()
 {
   m_->bSpecialOp_=true;

Configuration.hpp

@@ -183,6 +183,7 @@ public:
   bool highlight_only_fields () const;
   bool include_WAE_entities () const;
   bool highlight_73 () const;
+  void setSpecial_Q65_Pileup();
   void setSpecial_Hound();
   void setSpecial_Fox();
   void setSpecial_None();

widgets/mainwindow.cpp

@@ -6461,6 +6461,19 @@ void MainWindow::on_RoundRobin_currentTextChanged(QString text)
   ui->sbTxPercent->setEnabled (text == tr ("Random"));
 }
 
+void MainWindow::mousePressEvent(QMouseEvent *event)
+{
+  if(ui->q65Button->hasFocus() && (event->button() & Qt::RightButton)) {
+      m_specOp=m_config.special_op_id();
+      if (m_specOp==SpecOp::Q65_PILEUP) {
+          m_config.setSpecial_None();
+      } else {
+          m_config.setSpecial_Q65_Pileup();
+      }
+      m_specOp=m_config.special_op_id();
+      on_actionQ65_triggered();
+  }
+}
 
 void MainWindow::on_dxCallEntry_textChanged (QString const& call)
 {

widgets/mainwindow.h

@@ -211,6 +211,7 @@ private slots:
   void on_txb6_clicked();
   void on_lookupButton_clicked();
   void on_addButton_clicked();
+  void mousePressEvent(QMouseEvent *event) override;
   void on_dxCallEntry_textChanged (QString const&);
   void on_dxGridEntry_textChanged (QString const&);
   void on_dxCallEntry_editingFinished();

widgets/mainwindow.ui

@@ -2982,7 +2982,7 @@ QLabel[oob="true"] {
               </size>
              </property>
              <property name="toolTip">
-              <string>Switch to Q65 mode</string>
+              <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;Switch to Q65 mode. Right-click to toggle Q65 Pileup mode On/Off.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
              </property>
              <property name="text">
               <string>Q65</string>