Generate different character on long press

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Yes, I think I understood this. But as you said using Qukeys for that purpose was not intended and may have undesired behaviour. Also I am actually using Qukeys already and I am afraid the two different use cases could interfere with each other.

Therefore I thought about modifying the AutoShift plugin for that purpose. But I am totally lost there. I looked into other plugins how they provide such configurability, but they all do it in a different way (which is not nice even from a user-only perspective).

Qukeys:

QUKEYS(
    kaleidoscope::plugin::Qukey(0, KeyAddr(2, 1), Key_LeftGui),      // A/cmd
    kaleidoscope::plugin::Qukey(0, KeyAddr(2, 2), Key_LeftAlt),      // S/alt
    kaleidoscope::plugin::Qukey(0, KeyAddr(2, 3), Key_LeftControl),  // D/ctrl
    kaleidoscope::plugin::Qukey(0, KeyAddr(2, 4), Key_LeftShift),    // F/shift
    kaleidoscope::plugin::Qukey(0, KeyAddr(3, 6), ShiftToLayer(1))   // Q/layer-shift (on `fn`)
  )

CharShift:

CS_KEYS(
    kaleidoscope::plugin::CharShift::KeyPair(Key_Comma, Key_Semicolon),               // CS(0)
    kaleidoscope::plugin::CharShift::KeyPair(Key_Period, LSHIFT(Key_Semicolon)),      // CS(1)
    kaleidoscope::plugin::CharShift::KeyPair(LSHIFT(Key_Comma), LSHIFT(Key_Period)),  // CS(2)
  );

Chord:

  CHORDS(
    CHORD(Key_J, Key_K), Key_Escape,
    CHORD(Key_D, Key_F), Key_LeftShift,
    CHORD(Key_S, Key_D), TOPSY(Semicolon),
    CHORD(Key_S, Key_D, Key_F), Key_Spacebar,
  )

ShapeShifter:

 static const kaleidoscope::plugin::ShapeShifter::dictionary_t shape_shift_dictionary[] PROGMEM = {
  {Key_1, Key_2},
  {Key_2, Key_1},
  {Key_NoKey, Key_NoKey},
};

[…]

ShapeShifter.dictionary = shape_shift_dictionary;

And looking at the actual implementation the differences are even bigger. For someone who is not used to C++ and embedded programming I don’t know which variant to choose (and what the actual differences are and how they work).