add mouse layer

Author: yoshida-m-3

qmk_firmware/keyboards/keyball/keyball44/config.h

@@ -84,4 +84,4 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 // Automatic Mouse Layer
 #define POINTING_DEVICE_AUTO_MOUSE_ENABLE
-#define AUTO_MOUSE_DEFAULT_LAYER 1
+#define AUTO_MOUSE_DEFAULT_LAYER 4

qmk_firmware/keyboards/keyball/keyball44/keymaps/default/keymap.c

@@ -50,6 +50,13 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     RGB_RMOD , RGB_HUD  , RGB_SAD  , RGB_VAD  , CPI_D100  , SCRL_DVD ,                                        LCA(KC_D)  , LCA(KC_E) , LCA(KC_T) , LCA(KC_G)  , KC_KB_VOLUME_DOWN  , _______ ,
                   _______    , _______  , _______  ,        _______  , _______  ,                   _______  , _______  , _______       , _______  , _______
   ),
+
+  [4] = LAYOUT_universal(
+    _______  ,  _______   , _______    , _______   , _______    , _______    ,                             _______    , _______    , _______    , _______    , _______   , _______   ,
+    _______  ,  _______ , KC_BTN2  , KC_BTN3   , KC_BTN1   , _______   ,                                     _______  , _______  , _______    , _______  , _______  , _______  ,
+    _______  ,  _______ , _______  , _______ , _______  , _______  ,                                         _______  , _______  , _______  , _______  , _______  , _______  ,
+                  _______  , _______ , _______  ,         _______  , _______  ,                   _______  , _______  , _______       , _______  , _______
+  ),
 };
 // clang-format on