diff --git a/comfortable-swipe-gesture-swipe-xdokey.cpp b/comfortable-swipe-gesture-swipe-xdokey.cpp
index ae48584..20a5dcd 100644
--- a/comfortable-swipe-gesture-swipe-xdokey.cpp
+++ b/comfortable-swipe-gesture-swipe-xdokey.cpp
@@ -134,7 +134,7 @@ void gesture_swipe_xdokey::update() {
   gesture_swipe::update();
   // scale threshold to 1/10 when gesture is fresh
   // acts like our static friction coefficient
-  float scale = get_previous_gesture() == FRESH ? 0.01f : 1.0f;
+  const float scale = get_previous_gesture() == FRESH ? 0.01f : 1.0f;
   // we are working with floating points which are not exact
   // make sure we compare with a very small value (1e-6f)
   // if distance goes out of threshold, perform our swipe
diff --git a/comfortable-swipe-main.cpp b/comfortable-swipe-main.cpp
index 9c75d36..0435c8a 100644
--- a/comfortable-swipe-main.cpp
+++ b/comfortable-swipe-main.cpp
@@ -112,17 +112,22 @@ int main(int argc, char *argv[]) {
   // get input values
   string mouse3 = config.count("mouse3") ? config["mouse3"] : config["hold3"];
   string mouse4 = config.count("mouse4") ? config["mouse4"] : config["hold4"];
+  bool nomouse = mouse3.empty() || mouse4.empty(); // TODO: check if mouse invalid
   // create our mouse gesture holder
   gesture_swipe_xdomouse mousehold(mouse3.data(), mouse4.data());
   // start reading lines from input one by one
   for (string line; getline(cin, line);) {
-    // optimization: if no mouse config is set, just run keyboard
-    if (mousehold.is_swiping() && mousehold.button == MOUSE_NONE) {
+    if (nomouse) {
       keyswipe.run(line.data());
-    } else if (mousehold.run(line.data())) {
-      // only allow keyswipe gestures on mouse move
-      if (mousehold.button == MOUSE_NONE || mousehold.button == MOUSE_MOVE) {
+    } else {
+      // optimization: if no mouse config is set, just run keyboard
+      if (mousehold.is_swiping() && mousehold.button == MOUSE_NONE) {
         keyswipe.run(line.data());
+      } else if (mousehold.run(line.data())) {
+        // only allow keyswipe gestures on mouse move
+        if (mousehold.button == MOUSE_NONE || mousehold.button == MOUSE_MOVE) {
+          keyswipe.run(line.data());
+        }
       }
     }
   }
diff --git a/install b/install
index f838bcb..10caf51 100755
--- a/install
+++ b/install
@@ -98,9 +98,14 @@ function install_configuration_file {
 function install_main_program {
     # copy source to target with executable permissions
     # install to target, with hardcoded version
+    if [[ -f "$TARGET" ]]; then
+        trysudo rm "$TARGET"
+    fi
     trysudo sed -E "s/^VERSION=.*/VERSION=$VERSION/" "$SOURCE" > "$TARGET"
-    # allow execute permissions
+    # allow execute permissions with group
     trysudo chmod +x "$TARGET"
+    # make sure non-root user is owner
+    trysudo chown "$USER" "$TARGET"
     echo "Installed: $TARGET"
 }
 
@@ -114,10 +119,17 @@ function install_cpp_program {
     # compile program to temporary file first
     TMP_TARGET="$(mktemp)"
     $COMPILE "$COMPILE_SOURCE" -o "$TMP_TARGET" -DCOMFORTABLE_SWIPE_VERSION="\"$VERSION\"" -DCOMFORTABLE_SWIPE_CONFIG="\"$CONF_TARGET\"" -DCOMFORTABLE_SWIPE_AUTOSTART="\"$AUTOSTART_TARGET\""
-    # compilation ok, now try to install
-    # check permissions maybe if will need sudo
+    # compilation ok, now try to install with sudo
     trysudo mkdir -p "$(dirname "$COMPILE_TARGET")"
+    # remove existing file for permissions to work
+    if [[ -f "$COMPILE_TARGET" ]]; then
+        sudo rm "$COMPILE_TARGET"
+    fi
     trysudo mv "$TMP_TARGET" "$COMPILE_TARGET"
+    # bugfix: add with group permissions
+    trysudo chmod go+x "$COMPILE_TARGET"
+    # make sure non-root user is owner
+    trysudo chown "$USER" "$COMPILE_TARGET"
     echo "Installed: $COMPILE_TARGET"
 }