Your plugin has tons of features, I can’t figure out why you have not allowed it. I guess it retains field names imported from Contact Form7, but if you create a field it gives field like 1,2,3, etc. Which not a desired option, if you want to further process it.
I am using it on one of my websites along with its db storage plugin, but unfortunately the table ‘wp_vxcf_leads_detail’ is using EVA model, thus storing field data of single entry submissions in rows, instead of columns. Now I am writing code to export that data to another table with data related to every form field into separate column.
Though many other similar plugins are available, but I have adopted to yours due to the feature of keeping notes and sending email from the admin console.