Visit http://wifiheat.userecho.com/ and submit the suggestion. You can also vote on features, which can increase the likelyhood of a feature being implemented.
Email us at [email protected] with as much detail as possible, including a screenshot if necessary, along with the version of WiFi Heat and your Android version.
Are you an expert heatmapper? Have you made an impressive visualization? Feel free to email us to tell us about it. We are also collecting coverage maps that have been generated by WiFi Heat to put in the upcoming gallery.