diff --git a/README.md b/README.md
index 4651972..555cdba 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,9 @@ A Qt RepRap gcode sender/host controller
 
 Right now the project is in early stage, use only for development testing!
 
+## Screenshots
+![RepRaptor printing a file](http://reprap.org/mediawiki/images/2/2d/RepRaptor_screenshot0.png)
+
 ## Building on Ubuntu 14.04.2
 
 ```
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 9dfb725..b6c5f8f 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -406,6 +406,7 @@ void MainWindow::on_sendBtn_clicked()
         ui->sendBtn->setText("Send");
         ui->pauseBtn->setText("Pause");
         ui->pauseBtn->setDisabled("true");
+        ui->controlBox->setChecked("true");
         paused = false;
     }
     else if(!sending)
@@ -414,6 +415,7 @@ void MainWindow::on_sendBtn_clicked()
         ui->sendBtn->setText("Stop");
         ui->pauseBtn->setText("Pause");
         ui->pauseBtn->setEnabled("true");
+        ui->controlBox->setChecked("false");
         paused = false;
     }
 
@@ -423,14 +425,14 @@ void MainWindow::on_sendBtn_clicked()
 
 void MainWindow::sendNext()
 {
-    if(injectingCommand && commandDone && printer.bytesToWrite() < 100)
+    if(injectingCommand && commandDone && printer.bytesToWrite() < 150)
     {
         sendLine(userCommand);
         commandDone=false;
         injectingCommand=false;
         return;
     }
-    else if(sending && !paused && printer.bytesToWrite() < 100 && commandDone)
+    else if(sending && !paused && printer.bytesToWrite() < 150 && commandDone)
     {
         if(currentLine >= gcode.size()) //check if we are at the end of array
         {
@@ -454,11 +456,13 @@ void MainWindow::on_pauseBtn_clicked()
     if(paused)
     {
         paused = false;
+        ui->controlBox->setChecked(false);
         ui->pauseBtn->setText("Pause");
     }
     else
     {
         paused = true;
+        ui->controlBox->setChecked(true);
         ui->pauseBtn->setText("Resume");
     }
 }
diff --git a/settingswindow.ui b/settingswindow.ui
index f6030da..17bce22 100644
--- a/settingswindow.ui
+++ b/settingswindow.ui
@@ -51,6 +51,15 @@
     </item>
     <item row="0" column="1">
      <widget class="QSpinBox" name="senderbox">
+      <property name="toolTip">
+       <string>A good default is 5, lower = fater, higher = less CPU load</string>
+      </property>
+      <property name="toolTipDuration">
+       <number>100</number>
+      </property>
+      <property name="minimum">
+       <number>1</number>
+      </property>
       <property name="maximum">
        <number>999</number>
       </property>
@@ -72,8 +81,17 @@
     </item>
     <item row="1" column="1">
      <widget class="QSpinBox" name="statusbox">
+      <property name="toolTip">
+       <string>A good default is 5000. More = less interruptions, less = better temperature monitoring</string>
+      </property>
+      <property name="toolTipDuration">
+       <number>100</number>
+      </property>
+      <property name="minimum">
+       <number>500</number>
+      </property>
       <property name="maximum">
-       <number>9999</number>
+       <number>99999</number>
       </property>
      </widget>
     </item>