IMO it better suites CMD-TAB scenario than more general zmk-tri-state module.

It programmed to work 'as you expected out of the box'.

Short tap is just like quick cmd-tab press - switches to previous application.
Long tap (hold) opens up menu with all applications. In this menu you can navigate tapping same key.
Shit-tap in menu allows to navigate backwards (if your shifts are inside through-key-positions).
Space or Enter will activate selected application.
Escape will cancel menu and will not switch to selected applicaiton. Just like Cmd-Tab is working normally.

Any other keys will be ignored. Well, you know, just because I like it that way.



how to use:


= single short tap (within hold-tab-ms) sends single cmd-tab. essentialy switching to previous application
= hold will send press(LGUI), tap(TAB) - cmd-tab menu where you can navigate with TAB (same &cmdtab key) or Shift-Tab


how I use it in keymap:


    behaviors {

        cmdtab: cmd_tab {
            compatible = "zmk,behavior-cmd-tab";
            label = "SWAPPER3";
            #binding-cells = <0>;
            bindings = <&kt_on LGUI>, <&kp TAB>, <&kt_off LGUI>;
            through-key-positions = <96 97>; // shifts
            end-key-positions = <94 95 99>;  // esc, space, enter
            hold-tap-ms = <250>;
        };
    };

#define L1B6  &cmdtab


what's what:

through-key-positions: this keys will be send through without disturbing cmd-tab module
end-key-positions: pressing this keys will close cmd-tab window.

When end-key-positions keys are pressed we essentially sending press LGUI(any_through_keys_pressed(KEY))
and then releaseing KEY and LGUI.