diff --git a/toonz/sources/tnztools/fullcolorbrushtool.cpp b/toonz/sources/tnztools/fullcolorbrushtool.cpp
index fde2213..1f421a5 100644
--- a/toonz/sources/tnztools/fullcolorbrushtool.cpp
+++ b/toonz/sources/tnztools/fullcolorbrushtool.cpp
@@ -143,6 +143,9 @@ FullColorBrushTool::FullColorBrushTool(std::string name)
   m_prop.bind(m_preset);
 
   m_preset.setId("BrushPreset");
+  m_modifierEraser.setId("RasterEraser");
+  m_modifierLockAlpha.setId("LockAlpha");
+  m_pressure.setId("PressureSensitivity");
 
   m_brushTimer.start();
 }
diff --git a/toonz/sources/tnztools/tooloptions.cpp b/toonz/sources/tnztools/tooloptions.cpp
index 272b18e..d814c5b 100644
--- a/toonz/sources/tnztools/tooloptions.cpp
+++ b/toonz/sources/tnztools/tooloptions.cpp
@@ -125,7 +125,8 @@ ToolOptionsBox::ToolOptionsBox(QWidget *parent, bool isScrollable)
 ToolOptionsBox::~ToolOptionsBox() {
   std::for_each(m_controls.begin(), m_controls.end(),
                 std::default_delete<ToolOptionControl>());
-  std::for_each(m_labels.begin(), m_labels.end(), std::default_delete<QLabel>());
+  std::for_each(m_labels.begin(), m_labels.end(),
+                std::default_delete<QLabel>());
 }
 
 //-----------------------------------------------------------------------------
@@ -218,6 +219,17 @@ void ToolOptionControlBuilder::visit(TDoubleProperty *p) {
     control->addAction(a);
     QObject::connect(a, SIGNAL(triggered()), control, SLOT(decrease()));
   }
+  if (p->getName() == "ModifierSize") {
+    QAction *a;
+    a = cm->getAction("A_IncreaseMaxBrushThickness");
+    control->addAction(a);
+    QObject::connect(a, SIGNAL(triggered()), control,
+                     SLOT(increaseFractional()));
+    a = cm->getAction("A_DecreaseMaxBrushThickness");
+    control->addAction(a);
+    QObject::connect(a, SIGNAL(triggered()), control,
+                     SLOT(decreaseFractional()));
+  }
   if (p->getName() == "Hardness:") {
     QAction *a;
     a = cm->getAction("A_IncreaseBrushHardness");
diff --git a/toonz/sources/tnztools/tooloptionscontrols.cpp b/toonz/sources/tnztools/tooloptionscontrols.cpp
index bee24dc..24f64bb 100644
--- a/toonz/sources/tnztools/tooloptionscontrols.cpp
+++ b/toonz/sources/tnztools/tooloptionscontrols.cpp
@@ -192,7 +192,7 @@ void ToolOptionSlider::onValueChanged(bool isDragging) {
 
 //-----------------------------------------------------------------------------
 
-void ToolOptionSlider::increase() {
+void ToolOptionSlider::increase(double step) {
   if (m_toolHandle && m_toolHandle->getTool() != m_tool) return;
   // active only if the belonging combo-viewer is visible
   if (!isInVisibleViewer(this)) return;
@@ -201,7 +201,7 @@ void ToolOptionSlider::increase() {
   double minValue, maxValue;
   getRange(minValue, maxValue);
 
-  value += 1;
+  value += step;
   if (value > maxValue) value = maxValue;
 
   setValue(value);
@@ -213,7 +213,11 @@ void ToolOptionSlider::increase() {
 
 //-----------------------------------------------------------------------------
 
-void ToolOptionSlider::decrease() {
+void ToolOptionSlider::increaseFractional() { increase(0.06); }
+
+//-----------------------------------------------------------------------------
+
+void ToolOptionSlider::decrease(double step) {
   if (m_toolHandle && m_toolHandle->getTool() != m_tool) return;
   // active only if the belonging combo-viewer is visible
   if (!isInVisibleViewer(this)) return;
@@ -222,7 +226,7 @@ void ToolOptionSlider::decrease() {
   double minValue, maxValue;
   getRange(minValue, maxValue);
 
-  value -= 1;
+  value -= step;
   if (value < minValue) value = minValue;
 
   setValue(value);
@@ -232,6 +236,10 @@ void ToolOptionSlider::decrease() {
   repaint();
 }
 
+//-----------------------------------------------------------------------------
+
+void ToolOptionSlider::decreaseFractional() { decrease(0.06); }
+
 //=============================================================================
 
 ToolOptionPairSlider::ToolOptionPairSlider(TTool *tool,
diff --git a/toonz/sources/tnztools/tooloptionscontrols.h b/toonz/sources/tnztools/tooloptionscontrols.h
index 6af4bbc..6698552 100644
--- a/toonz/sources/tnztools/tooloptionscontrols.h
+++ b/toonz/sources/tnztools/tooloptionscontrols.h
@@ -119,8 +119,10 @@ public:
 protected slots:
 
   void onValueChanged(bool isDragging);
-  void increase();
-  void decrease();
+  void increase(double step = 1.0);
+  void decrease(double step = 1.0);
+  void increaseFractional();
+  void decreaseFractional();
 };
 
 //-----------------------------------------------------------------------------
diff --git a/toonz/sources/toonz/mainwindow.cpp b/toonz/sources/toonz/mainwindow.cpp
index 73a3525..3061ae7 100644
--- a/toonz/sources/toonz/mainwindow.cpp
+++ b/toonz/sources/toonz/mainwindow.cpp
@@ -2161,6 +2161,10 @@ void MainWindow::defineActions() {
   createToolOptionsAction("A_ToolOption_JoinVectors", tr("Join Vectors"), "");
   createToolOptionsAction("A_ToolOption_ShowOnlyActiveSkeleton",
                           tr("Show Only Active Skeleton"), "");
+  createToolOptionsAction("A_ToolOption_RasterEraser",
+                          tr("Brush Tool - Eraser (Raster option)"), "");
+  createToolOptionsAction("A_ToolOption_LockAlpha",
+                          tr("Brush Tool - Lock Alpha"), "");
 
   // Option Menu
   createToolOptionsAction("A_ToolOption_BrushPreset", tr("Brush Preset"), "");