Need Suggestions on Service Desk Customizations

[RG]

HI Team,

Could you please help/suggest resolutions for below questions:

1. Is any possibility is there to add new attachments in Resolved tickets. (Resolved status, if no comments added by reporter then it will be closed after 2 days)
2. Replies to a closed ticket do not automatically create a new ticket. If its not possible then  if the reporter answered after 5 working days to a close ticket, that the reporter get an automatic generated notification from JIRA stating You cant reopen the ticket, please raise new ticket for the same.
3. Is it possible to make fields mandatory in JIRA service desk? If we have updated the field behavior as mandatory its working fine from JIRA Web form but but affecting emails by email handler.

4. Reporter are getting unwanted/multiple notifications for single actions.

Note: We are using "Email This Issue for JIRA " plugin