Terraria is not a class based game, but rather a game with classes. Believe it or not there's quite a big difference. I don't like the idea of adding a "select a class" feature to the game, as it will make new players feel like it is a class based game. I feel like this would overall be negative, as the intended point is to okay through the game, find out what you like, and go from there.
Furthermore, starting with anything aside from the copper shortsword would provide you with a very noticeable advantage, as everything that doesn't have better damage, has better attack patterns (with the wooden hammer for example, the overhead arch).
Overall, for the reasons listed above, I do not support this suggestion.