Just a couple of weeks passed the membership of the Church sustained all 15, (12 apostles + 3 in the First Presidency) as prophets, seers, and revelators.
A seer is someone who prophecies future events. Nothing in the definition says anything about translating ancient documents by the power of God, however that power is manifest.
So the questions about bringing forth new scripture by way of translation is incorrect.
Mosiah 8:13-18
13 Now Ammon said unto him: I can assuredly tell thee, O king, of a man that can translate the records; for he has wherewith that he can look, and translate all records that are of ancient date; and it is a gift from God. And the things are called interpreters, and no man can look in them except he be commanded, lest he should look for that he ought not and he should perish. And whosoever is commanded to look in them, the same is called seer.
14 And behold, the king of the people who are in the land of Zarahemla is the man that is commanded to do these things, and who has this high gift from God.
15 And the king said that a seer is greater than a prophet.
16 And Ammon said that a seer is a revelator and a prophet also; and a gift which is greater can no man have, except he should possess the power of God, which no man can; yet a man may have great power given him from God.
17 But a seer can know of things which are past, and also of things which are to come, and by them shall all things be revealed, or, rather, shall secret things be made manifest, and hidden things shall come to light, and things which are not known shall be made known by them, and also things shall be made known by them which otherwise could not be known.
18 Thus God has provided a means that man, through faith, might work mighty miracles; therefore he becometh a great benefit to his fellow beings.
Mosiah 28:11-15
11 Therefore he took the records which were engraven on the plates of brass, and also the plates of Nephi, and all the things which he had kept and preserved according to the commandments of God, after having translated and caused to be written the records which were on the plates of gold which had been found by the people of Limhi, which were delivered to him by the hand of Limhi;
12 And this he did because of the great anxiety of his people; for they were desirous beyond measure to know concerning those people awho had been destroyed.
13 And now he translated them by the means of those two stones which were fastened into the two rims of a bow.
14 Now these things were prepared from the beginning, and were handed down from generation to generation, for the purpose of interpreting languages;
15 And they have been kept and preserved by the hand of the Lord, that he should discover to every creature who should possess the land the iniquities and abominations of his people;
16 And whosoever has these things is called seer, after the manner of old times.
It seems the Book of Mormon strongly implies a seer has interpretor stones and does interpret.[/quote]