In the mean time to get by you can setup a playlist for each movie. For example, the movie "Steal Today Gone Tomorrow, go into WMP11 group all those files into a playlist and call it "Steal Today Gone Tomorrow. Find the playlist (.pls) file and copy it to the same folder with all the movie files for that particular movie. Now, here is the sweat part. If your using an external hhd with your dlink, copy the folder with the movie segments and the .pls file to the external hdd. With your external hdd connected to the dlink, it will see the folder and the .pls file. Select the .pls file and it will start playing the movies in the order you specified when you set up the playlist. If your steaming from WMP11 or any other UPnP server, instead of selecting a movie file, you select the .pls file...and BAM!!!, you have gapless playback.
So there you have it. Gapless playback with a little bit of ingenuity. So DLink, don't be in a rush to add gapless playback directly into the DSM-750. Use some of those saved resources to get the Netflix WatchNow service on the machine.