Private and Public keys....

I am on a mac and have generated private and public keys.
Can WinSCP use these public keys? If so how?
This should allow me to run scripts on the mac that don't have to log in to win scp.
Will doing this preclude other users of this installation of WinSCP from using regular logins?

Sorry, I do not understand what are you trying to achieve.

See documentation about using keys in WinSCP. Maybe it helps.