If you edit a mix file, the changes are handled on the spot and you don't need to save.

And for the FA2 question, use a string table editor to add text in RA2.csf, then make a text trigger reffering to the text.

For example, some entry in ra2.csf:

Name:
0000

Text:
Destroy the Psychic Sensor

You FA2 text trigger must point to 0000

meselfs himself!