Sure that it would be nice to have a real 5/4 without waiting a new B in a B release. Finally i found that a style like "54_even" sounds like a 5/4 time signature. But it works only if the time signature is 4/4 in B in a B !!

With this style you can make an accompaniement for Dave Brubeck compositions like "Take five" or "Far more blue". You just have to enter the chords. But I dont know how to enter the melody ! Better play it with your music instrument and not with B in a B .....