afew more SO questions

ok just afew questions about star ocean which i'm not too sure about.

1) when you have made a BT collection and you want to start a new game do you have to use the load the data from another save command?

2) On the fangs of the wicked weapon it has a 100% chance of breaking but because i am unsure of what it does i have always taken it off so what does it do?

3) I know that after getting 95% of the collection you unlock the full auto mode what is the full auto mode?

4) i have meteor swarm for sophia and it won't let me make it useable in battle do i have to do somthing first?

so there are the questions i have for now.