Lets look at some other two handers that have the 1h/2h flag:
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loginNow lets look at the Studded Warclub's stats:
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loginThe studded warclub is slightly longer and faster than the morningstar (and is of course balanced), but has far less damage and weight. It's much, much shorter than the goedendag, doesn't have nearly as good a stab, though it is slightly heavier and has a little more damage. It fits very neatly in-between, and is (arguably) inferior to both. Giving it the 1h/2h flag to make it carryable in one hand would be a small but effective buff to make it a more attractive weapon.
Also, obligatory "It doesn't have crushthrough anymore make it useable on horseback again." It would give 1h players the nice longer blunt alternative on horseback that they've been clamoring for without having huge balance implications (since 2h weapons take a damage and speed penalty on horseback).