Hey, we can look into doing this, to make the ProsperInsert more easily customized. If you are looking to change all the ProsperInserts to look a certain way though you can do that with the themes in the Advanced Settings.
Best way would be create your own directory inside prosperent-themes in the wp-content directory. (Creat the prosperent-themes directory if it doesn’t exist.)
Then create a file called insertProd.php inside your directory.
You can copy the code from the plugin for insertProd.php (found in /plugins/prosperent-suite/includes/views/prosperinsert) and make any changes to that you’d like. This would affect all the ProsperInserts on your blog, so if you were looking to change only a few it wouldn’t do that.
We will definitely look into applying your idea though, I like it and I think it would allow a lot of customization, I wouldn’t mind doing something similar for the ProsperShop as well.