It's a small tool for generating variations on a chord progressions, not writing songs or coming up with melodic ideas. No need to make everything complicated.

You seem to have some expectations of OP's tool that aren't set by anything in the post. If your skill level is such that you'd benefit from what it's trying to be, you're probably still stuck writing simple whole-bar chords in a progression and anything more is just confusing. That doesn't sound like you, and it's not me, but it's a lot of people.