BIAB has power chords. These are two-note chords that only have the root and the fifth. As @dcuny mentioned, if you want a power chord without a third, simply use the '5': for example, C5 (notes = C and G), D5 (notes = D and A). These chords work both in major and minor settings because it is the missing third that determines if a chord is major or minor.

With that in mind, to get (say) Cmaj7 (no 3rd) [notes = C G B], it would be possible to use C5 as the starting place. Using Playable Realtracks, you could then manually add the note B to the chord in either Notation Mode or Piano Roll Mode.

The image below shows a B that I've added to a C5 chord. In other words, what you want can be done but it is a semi-manual process. It's not necessary to add the major 7th note to all tracks. Because it is a dissonance, it usually suffices to add it just to one instrument and let the other instruments play the standard X5 chord. A general rule of classical music theory is that because dissonances stand out to the ear, it is often better not to double them by placing them in multiple instruments.

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Here are a couple of videos that explain playable Realtracks.



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