Gmail feature request: the ability to edit subject lines

I added this feature request to Gmail suggestions today:

Gmail Suggestion

Ability to edit subject lines.

One of the most powerful features of Outlook is the ability to revise the subject line.

Why is this so powerful?

Because of search. Editing subject lines allows one to both add terms important in search, and increases the value of search results. Since results always display subject lines, good subject lines make search returns more useful.

I depend on this feature in my use of Outlook. I very much miss it in Gmail.

Gmail suggestions allows one to vote on new features that are being considered. It's worth a visit, though I suspect if one enters the same email address too frequently the votes are discounted.

I wonder if Google ranks feedback based on the reputation associated with the email address provided?