Yes, you can refer a candidate for multiple jobs. In case you think a candidate is suitable for more than one position, you need to submit the referral multiple times and the candidate needs to apply for multiple jobs.
A pending Referral is a referral that is yet to be accepted by the candidate, while an accepted Referral is an uncompleted Referral. Read more about the Referral statuses here.
No, the Talent Scout feedback will just be visible to your HR team and will not shared with the candidates.