fix issue where shifted keycodes don't work

- mitigate issue where &lt->&kp <symbol> outputs the unshifted code,
  if typed quickly, if using Alacritty
- add behavior that hits shift ->key w/ a small delay
- see zmkfirmware/zmk#759

config/slicemk_ergodox_dongle.keymap

@@ -21,6 +21,22 @@
 #define L_BLU 3
 #define L_TST 4
 
+
+/* shifted-press */
+/* fix issue where some programs interpret shifted keycodes w/o the shift; eg. &kp EXCL -> 1 */
+/* SEE https://github.com/zmkfirmware/zmk/issues/759 */
+/* I observed this if using a &lt -> &kp <symbol>, if pressed rapidly, the number results */
+/* I observed this in Alacritty, but not in gnome-terminal */
+ZMK_BEHAVIOR(sp, macro_one_param, \
+    wait-ms = <16>; \
+    tap-ms = <0>; \
+    bindings = \
+        <&macro_press &kp LSHFT>, \
+        <&macro_param_1to1>, \
+        <&macro_tap &kp MACRO_PLACEHOLDER>, \
+        <&macro_release &kp LSHFT>; \
+)
+
 /* left-hand HRMs */
 ZMK_BEHAVIOR(hml, hold_tap,
     flavor = "balanced";
@@ -100,7 +116,7 @@ ZMK_BEHAVIOR(hmr, hold_tap,
 			bindings = <
 				&bootloader
 				&none      &none     &none    &none     &none                   &none       &none  &none            &none     &none         &none        &none                &none                 &none
-				&kp TILDE  &kp EXCL  &kp AT   &kp HASH  &kp DOLLAR              &kp PERCENT &trans &kp C_PLAY_PAUSE &kp CARET &kp AMPERSAND &kp ASTERISK &kp LEFT_PARENTHESIS &kp RIGHT_PARENTHESIS &kp PIPE
+				&sp GRAVE  &sp N1    &sp N2   &sp N3    &sp N4                  &sp N5      &trans &kp C_PLAY_PAUSE &sp N6    &sp N7        &sp N8       &sp N9               &sp N0                &sp BSLH
 				&kp ESC    &kp LT    &kp LBRC &kp LBKT  &kp MINUS               &none                               &none     &kp UNDER     &kp RBKT     &kp RBRC             &kp GT                &kp ENTER
 				&kp LSHIFT &kp LCTRL &kp LALT &kp LMETA &kp PLUS                &none       &trans &kp C_NEXT       &none     &kp EQUAL     &kt RMETA    &kp RALT             &kp RCTRL             &kp RSHIFT
 				&none      &none     &none    &none     &none                                                                 &none         &none        &none                &none                 &none