diff --git a/dot_pi/agent/settings.json b/dot_pi/agent/settings.json
index 42236b1..116242d 100644
--- a/dot_pi/agent/settings.json
+++ b/dot_pi/agent/settings.json
@@ -1,8 +1,8 @@
 {
-  "lastChangelogVersion": "0.80.10",
+  "lastChangelogVersion": "0.82.1",
   "theme": "dark",
-  "defaultProvider": "kimi-coding",
-  "defaultModel": "k3",
+  "defaultProvider": "alibaba-code-plan",
+  "defaultModel": "qwen3.8-max-preview",
   "showHardwareCursor": false,
   "defaultThinkingLevel": "high",
   "quietStartup": true,
@@ -19,4 +19,4 @@
     "npm:pi-powerline-footer",
     "npm:pi-webaio"
   ]
-}
\ No newline at end of file
+}
diff --git a/private_dot_config/karabiner.edn b/private_dot_config/karabiner.edn
index 3efc657..74641b9 100644
--- a/private_dot_config/karabiner.edn
+++ b/private_dot_config/karabiner.edn
@@ -46,7 +46,19 @@
          }
 
   :main [
-         
+
+         {:des "Trackball: hold forward (button5) + roll -> scroll; tap = forward"
+          :rules [{:type :basic
+                   :from {:pointing_button :button5 :modifiers {:optional [:any]}}
+                   :to [{:set_variable {:name "ball-scroll" :value 1 :key_up_value 0}}]
+                   :to_if_alone [{:pointing_button :button5}]
+                   :conditions [{:type :device_if :identifiers [{:vendor_id 1133 :product_id 50504}]}]
+                   :parameters {:basic.to_if_alone_timeout_milliseconds 200}}
+                  {:type :mouse_motion_to_scroll
+                   :conditions [{:type :variable_if :name "ball-scroll" :value 1}
+                                {:type :device_if :identifiers [{:vendor_id 1133 :product_id 50504}]}]
+                   :options {:momentum_scroll_enabled true :speed_multiplier 0.6}}]}
+
          {:des "pedals default"
            :rules [:pedals  [:left_pedal   :!Tleft_command]
                             [:right_pedal :!TSleft_option]
@@ -199,4 +211,3 @@
     ;; P  | caps_lock
     ;; !! | mandatory command + control + optional + shift (hyper)
     ;; ## | optional any
-