There is the question of the Paths of the Dead episode, in which the men who had reneged on their vow to Isildur had their fëa trapped in Middle Earth for 3000 years until they eventually made good on their obligation by coming to Aragorn's aid.
Who prevented their fëa from leaving?
Isildur? If Mandos didn't have control over the fëa of men, then how could Isildur? Moreover, how could Isildur have controlled someone else's fëa long after his own fëa had gone on its merry(?) way?
Eru? perhaps...although only rarely did Eru intervene in Arda, so it seems somewhat out of character.
Manwë? A definite possibility. But I think Mandos is more likely, since his domain among the Valar was fate and the disposition of fëa.
I think it's likely that Mandos did have some degree of control over the fëa of men, at least under certain circumstances.
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