I fully support the need for us Japanese-literates to be able to legitimately type in Japanese. I know there's a long history as to why it hasn't been allowed us, but it is a continuing serious problem. I only play on PC, so the PS2 thing doesn't really affect me, but I would pay to use the legit. IME

For those who say just use romaji, even if the Japanese were willing to attempt to read it, it would be similar to having to read English in kana (I know the example is shot because katakana is made for foreign words so i'll expect to be reading an English word) I can read it, but it'll take a little longer
For those who say to use the "other forms" there's always the risk that a GM notices and is feeling strict that day.
For those who say use the JP client, My (and I'm sure many other JP-literates) Japanese is decent enough for a conversation, not to play an entire game in, particularly such a richly RPG one like this