If you have a Vial of Prismatic Dye in your inventory, the "Save Dye" button in the dye window is clickable. If you don't, it's not. So I'm guessing without client side hackery, it's not possible to change. Unless the server tells the client to enable the button, but I don't think that's the case, but I haven't looked either.
EDIT: I guess it could also be a certain flag is set in the item field, but I'd have to look at that too.
EDIT2: There is an itemtype that we call Dye (so does alla), but that client doesn't seem to enable the dye button for any of these, except for the Vial of Prismatic Dye
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