It seems that you're very much focused on the plugin for the last few days. You're keeping it improving day by day. Thank you for all your efforts.
This is very minor suggestion. Just wanted to draw your attention as it should be easy for you and you're working a lot on the plugin nowadays.
My Google page speed test gives me the following suggestions:
The following image(s) are missing width and/or height attributes.
/wp-content/plugins/comprehensive-google-map-plugin/assets/css/images/directions.png (Dimensions: 24 x 697) (2 uses)
/wp-content/plugins/comprehensive-google-map-plugin/assets/css/images/transparent.png (Dimensions: 1 x 1) (4 uses)
I think you can easily fix that. Just do it if it is easy, otherwise just ignore this suggestion.