while i havent used the game shark on FFT save once when i just got it (froze my game and corrupted the file. it was promptly "disposed of") I think i know the answers to your questions

1) the GS changes the character in a certian slot to the job. was the character you changed male to start with? the GS only changes the skin and job commands not the sex

2) that is more of a story event like killing worker 7 and it reviveing or weigraf