Game set up: For a middle or endgame study themes,

While these are readily available on Computer Workout, could a workable option be made for two Players to set up a middle, or an endgame with a minimum of......say 10 pieces [No Computer Assistance],

Likened to a Thematic Opening on Turn-Based, the Player selects the Pieces desired or inputs FEN, and "begins" the game from there,

Rated game options are not a necessity, as the suggestion here is leaning towards a form of a study tool,

sample:

As what you will see on a Nalimov TB, without the varied or possible outcomes displayed,

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Agree with NimzoRoy. But very nice suggestion. To play slowly through tough and dubious endgames (I have one on my profile)! ;)