Of course, it’s always been possible to move tracks between programs and drag and drop capability has made that easier, but that is not the point. The original post probably should have been part of the RealBand Wishlist instead of BIAB. The suggestion was meant as a way to add one feature that would go a long way to satisfying the many requests for very specific RealTracks.
RealBand already has the chord information. If a user could select a section of a track, add a standardized loop (acidized as the defacto PC standard) and have RealBand automatically do the pitch shifting and time synching it would exponentially increase the audio loop sound palette available to users. The vast supply of third party loops and construction kits would add the same life and believability to a mix that users are looking for with RealTracks.
Obviously, this is not as elegant as having a complete set of RealTrack loops and having the program intelligently do the selecting and arranging, but it was offered in response to threads I have seen with users entertaining the idea of creating their own RealTracks. Selecting your own loops would only be a subset of that process.
Adding this feature to RealBand would add significant capability to an already killer program and might not take much more effort that fixing the drag and drop effort has taken.