Feature Request: Do not automatically reopen tickets on customer response

Currently any response to a solved tickets causes it to reopen.  Many of our customers write back with 'thank yous' or 'yes, that worked' responses.  The fact that these automatically reopen tickets causes multiple issues:

1. Feedback requests, problems and incidents that were moved to on-hold and targeted move back to Open, causing confusion among the product team

2. Metrics such as "one-touch tickets", "two-touch tickets", and "reopened tickets" are not able to be accurately tracked

3. Agents must take additional time to re-close tickets.  (I know that this could be done with a trigger, but some reopens are legitimate issues).

Desired functionality: Allow customers to chose whether a ticket should be reopened or allow an option to not set tickets to Open on reply.