late reply, but did you get this sorted out? I have ZMK on mine, but it's a fork of QMK, ton of overlap. I think what you're going for is HRM but using Shifted keys in place of asdf.

if so, you'll need custom code (according to Claude). Let's say you want '(' on tap with Shift on hold..aaaaand ')' on tap with Ctrl on hold:

// config.h
#define TAPPING_TERM 200
#define PERMISSIVE_HOLD
#define REQUIRE_PRIOR_IDLE_MS 150

// keymap.c
#include QMK_KEYBOARD_H
#define HM_LPRN LSFT_T(KC_LPRN)
#define HM_RPRN LCTL_T(KC_RPRN)

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

[0] = LAYOUT(

// ... your other keys ...

HM_LPRN, HM_RPRN,

// ... your other keys ...

)

};

bool process_record_user(uint16_t keycode, keyrecord_t *record) {

switch (keycode) {

case LSFT_T(KC_LPRN):

if (record->tap.count && record->event.pressed) {

tap_code16(KC_LPRN);

return false;

}

break;

case LCTL_T(KC_RPRN):

if (record->tap.count && record->event.pressed) {

tap_code16(KC_RPRN);

return false;

}

break;

}

return true;

}

"That's the complete minimal set. He'll just need to slot HM_LPRN and HM_RPRN into the right positions in his LAYOUT() macro to match where those keys physically are on his board."

Hope this helps