Thank you for your advice. The thing is, I'm not good on the keyboard, so if I had to do a strings or horns pass, I'd do a very sloppy job. I recently downloaded the free version of IKMultimedia's "Sample Tank", hoping that I'd be able to use some of its orchestral instruments, but I see it doesn't follow BIAB chord progression like the Coyote Synth does. Anyway, I'm taking an audio class and we are going to be looking into Reason, so I'll get a bit of a taste into the program and see if I can make it work for me.
Meanwhile, I'd still love to see BIAB developing Classic RealTracks...