Hello Adrian,
1- Actually the best way is to export from GT to CSV and then import to GD via CSV (in this page you will find some documentation). User and password are handled by wordpress, so you need to export the wp_users table from the database
2- you can set a different page for the listings and using a different homepage, You can set the “Listings” page in the permalink setting (in Geodirectory)
3-The detail page will blend into the theme you are using (assuming you are using a GD compatible theme, Enfold in this case). Any further modification in the layout will involve custom code.
4- no ETA, Stiofan or Paolo could be more accurate about this question
5-The compatibility pack will create a bridge between GD and Enfold, so they will blend and fit together nicely as a “native” feature.
6- no ETA, Stiofan or Paolo could be more accurate about this question