Lengthen mod-tap duration

config/sofle.keymap

@@ -27,6 +27,17 @@
         };
     };
 
+    behaviors {
+        mt: mod_tap {
+            compatible = "zmk,behavior-hold-tap";
+            #binding-cells = <2>;
+            flavor = "hold-preferred";
+            tapping-term-ms = <300>;
+            bindings = <&kp>, <&kp>;
+            display-name = "Mod-Tap";
+        };
+    };
+
     keymap {
         compatible = "zmk,keymap";