No doubt a stupid question on "Playback"

[whatever]

I feel like an idiot asking, but ... what is the "Enable Playback" setting for? When I have the Play column shown, it's always blank throughout. As far as playing downloaded video files, I've always been able to run videos from the Files tab. I can't see what the Playback feature adds or changes.

I have read the help file, which simply says "Playback allows you to seamlessly play your audio/video files with your default player based on file extension or specify a specific player to use for all files." Like I said, maybe I'm just being thick, but I can't see a way to actually use this feature.

[whatever]

Ah, I guess I see now. I had to uncheck the "Use default player" option. Then--and only then--a "play" button appeared in the Play column. I guess if "Use default player" is enabled, the playback feature is useless. If so, I fail to see why there is a "Use default player" option under "Enable playback" in the first place.

[Switeck]

And that feature can in theory reduce download speeds, if not for you then for others on the same torrent.

It tries to complete the torrent in semi-sequential chunks so it can play back beginning-to-end AS it downloads. This can make end-of-torrent rare pieces more rare, because your client (and others doing the same thing) will be making demands from seeds for non-rare pieces closer to the beginning of the torrent.