1- It appears automatically on my system
SPRO: FSCM -> Treasury and Risk Management -> Transaction Manager -> General Settings -> Organization -> Define Company Code Additional Data
and there you have info about "Exhcange Rate Settings". Also go to "Define Calculation Indicator" in the same SPRO path
3- It's for payment requests for customers (tx F111). I haven't implemented it but I've seen most doc on SDN with Money Market operations and Values.
4- CashFlow ? FF7A , FF7B ?
SPRO: FSCM -> Treasury and Risk Management -> Transaction Manager General Settings -> Link to Cash Management -> Assign Planning Levels.
Regards