Sometimes you want to respond to a review because someone might give you a negative review for seemingly no reason or someone may be having a problem and post it in the user reviews instead of contacting you!
A feature similar to Google Play would be great!
Part of what this would need to work well would be notification when a review is posted. There are notifications for forum posts and other changes, but not for reviews.
I filed a separate feature request for this - #382 Send Notification to Developers When a Review Is Posted - because I might also want to respond to a positive review, but the few times it has happened on my very small project, I didn't find out for a few months - when it was too late to get the poster's attention.
Although what is needed here is the ability to respond to a review on the project page itself so other viewers can read the response before forming an opinion based on only one side of the story, there is a partial workaround that at least allows a response to the reviewer.
Take the user's name and plug it into https:///sourceforge.net/u/username in the address bar of the browser and that takes you to their SF home page where you can send them a message. It would be nice if there was a way to do this automagically - to respond to a review privately.
There is a need to respond to very old reviews. The lowest rated review on our project complains about something that we improved and fixed two years ago. Yet we cannot add a note to say this has been fixed.