Real Band..."The Phoenix"
It can do everything as you said:

"Best of all i can enter the chords in the chords window, pick a style and generate a real BiaB arrangement just like ... you guessed it BiaB!"

And speaking of entering chords from Real Books (the original jazz extended chords)...or even "copping" cool jazz type progressions for "jazzier-sounding" moving-chord additions to tunes and jazz playlists!

The electronic Fake Books available today, onlin...and there are many, many of those...(as I mentioned in my post on FB's...they also offer extras features, like Midi Progressions that can be copied into RB, (and even the $8.00 iRealBook at the Apple App Store, can be another source for jazz-oriented chord changes as well as chord melody or chord leading-tone examples)... that can be utilized in composing original and new forms of chords for RB!

(Huh??) G-Daddy, have another shot of that "breakfast good stuff" you're sipping on!!