Re-coded big chunk of code on how trading modes are handled and now TradeMe will support option to add custom trade modes with some simple plugins. Example plugin is in 9kb size and you can find it over github. Its as simple as it can get, you will need only 2 classes for it to implement new trade mode. Some extra explanations will be coming later on, mainly just to show how to add trades with accept fields, but you can always check it in main plugin as its working in same way and trade mode are being added in same way as you would be adding new trade modes with 3rd party plugin. Enjoy