...
Anyone know why this limitation exist?
This is Yamaha, and you have to get used to it!
BTW, buy a license of StyleMagic YA software from
www.midisoft.pl (it's only 50 euros/60 dollars or something like that). It has all you need to build a style in each measure signature you want, you can convert from 4/4 in 6/8. But there are some limitations that Style Engine (Style Function of Yamaha) will not read some of your controls, like Sustain control (even if Style Magic YA accept to insert in channels event and will play it thru midi usb cable, when you will import the style in keyboard, that control will be ignored). Like this one, there are more things you cannot do because keyboard "will not understand", like half bar measure (you want a 3/8 and your style is 6/8.. you cannot insert that measure, but you can use the new function of Half Bar fill on assignable buttons
)
Regards,
Vali