Since freeplay is only available out of combat, I'd like to propose the following:
Let bards have an option to turn their whole keyboard into lute key notes. For example QWERTY would become 12345 with UP arrow key while ASDFG would become 12345 with DOWN arrow key, effectively letting people play multiple notes at once. It would block movement keys until perform mode is turned back off with "`" key but it should really well expand the capabilities of players for composing/recreating songs.
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Comments
Don't forget flats and sharps, especially if you are really targeting chords ^^.
You can fit the 12 semi-tones of an octave on a standard keyboard on each of the 3 upper rows (1... ; Q... ; A...)
With the 3 octaves semi-tones directly available in "pro perfomance" without combining keys, you can also think about varying the dynamic, for exemple with shift/ctrl (shift + note = forte ; ctrl + note = piano) and so allow bards to add more musical expression in their perfomances
I'd most likely still go with as I said and simply press left and right when needed.