[bsoriano]

No, you're right, there's no marks for music in other skins. Actually I noticed that Kodi don't have an button to mark as watched for music.

About recently played movies and recently played episodes:
I talk about this because this global option affect recently played tv shows, and may this confuse people. And if you keep they this way maybe someday someone may come here asking for you remove watched itens in recently played movies or episodes. I know that you may prefere this configuration (and I'm too) but other users maybe not. For keep it more customizable (to cover more cases) you have do add this option for individual shelfs and not global, in my opinian. 

@edjalmo, thanks! I think you are correct with recently played, I will add the separate playlists for those. I will not be making this an option on a shelf by shelf basis, the code would be too complicated for me.

Regards,

Bart  

Thanks! In this case keep all default for showing watched items or not (just to not get messy) and change the label of the global option to indicate that it work only for recently added shelves. 

@edjalmo, I thought about this some more, and I will leave recently played movies and episodes as they are.  It does not make sense to me to only have in-progress items in these; if you want to show only in-progress, you can use the in-progress movies shelf or in-progress episodes shelf.  Both of those are already sorted by default on lastplayed date, descending.  Also, I will leave the label for the new option as is.  My explanation of the feature covered all of the scenarios where it applies.

Regards,

Bart