Many of the style programmers read our posts here. Chris Anthony, who many years ago worked only for Generalmusic, has been freelancing for many years now and has done styles for the Yamaha Tyros, Roland G and E series as well. I know several Korg programmers who live throughout the USA and Italy.
I was invited to Yamaha many years ago along with another store owner from the east coast to assist Yamaha in giving examples of songs which contain the types of music the styles should come from.
I do think the majority of manufactures listen to what you have to say and do their best to develop styles they think their customers want.

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George Kaye
Kaye's Music Scene
Reseda, California
818-881-5566
www.kayesmusicscene.com