Prado - You don't mention whether your hope is to generate vocal or instrumental melodies - quite a difference here. There are so many variables in even choosing a melodist to work with.
There are no real shortcuts - just experimentation - and generating and regenerating. Each regeneration of a melody is like shaking the die only with notes - a different result.
I don't mess with the parameters much because I don't understand the musical term adjustments - I just find a melodist I like.
I write lyrics but I don't look for melodies for lyrics using this feature. I use it more for "fills" between vocal phrases - another soloist as it were. I block off the bars for a passage to generate, then keep regenerating until I get something I like. Then I move off to the next group of bars.
Not sure if that helps but there is not a lot written about how to use all of the melodist features for maximum advantage.

Good luck - Ian

Ian
My "Original Tunes" Site
My gene pool needs more chlorine.