Pronouns?

[reiichi]

What makes you confident?

That "binary toggle" for setting male or female pronouns is the same one for setting whether the character is male or female. There isn't a separate record of what pronouns to use - and if you "open it up to players' choice" (or even add a single third option) then it stops being a binary toggle and becomes something that needs to hold more data than the simple binary on/off.

It's also just not how the script works.

It doesn't store "he/she" in some separate place and drop them into the script as required; pronouns are built into every single piece of script individually. It might be he/she, him/her, sir/madam, Master/Mistress [Forename] or it might be an entire sentence or paragraph that needs to change for a particular situation. It would be a huge undertaking to alter every single line of text to include a third option, and open choice wouldn't even be feasible.

Actually....the game scripts very much store a general script that uses a <gender placeholder>. The same way it does for <race placeholder> too. There's a fair amount of branching and text payloads that go on in the game's scripts and making additional changes isn't the massive task you may think it is.

While directly talking about datamined resources and where to find them is against the ToS, it's also only a quick internet search away and there is a whole third party plugin system that includes a pronoun preferences option. (Now injecting additional pronouns in would be a bit more...tricky, but not impossible.)