I like a couple of the ideas presented here.

Time signature handling other than 4/4 and 3/4 realistically.

And I really like the idea of build your own style based on a given song and the choice of several variables.

Currently you select a genre...such as country.... then the subcategory of lets say, modern country. You're then presented with a large list of styles that are close.... some not so much.... but the choice becomes a search for the proverbial needle in the haystack. Yes, you can input a song title or artist name but that gets you the same/similar list of dozens if not hundreds of styles to select from. While this is hugely helpful in writing.... it's also at times a stumbling block since ....I don't know about you, but I will sometimes become distracted just auditioning the styles and 15 minutes later.... the idea has kinda faded.... and maybe I'll find something that kinda fits, or not. Building a style from rules and questions asked by the program would be quicker to get to the style that best fits the song style you are looking for. Keep the option of the list as that is often a way I will look for a song idea that gets sparked from just listening and auditioning the styles.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
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The magic you are looking for is in the work you are avoiding.