Nice~!!!!
Could u please also check for these feature:
1. The proxy file can be converted back to editable mesh obj like corona render did(corona can simply right click,choose convert to mesh) which will more helpful to modify the original mesh obj
2. Could u also check those "invisible" option for the proxy obj? btw MS plugin can't produce object invisible!
3. Please make obj secquence animation proxy files support!
4. Please check different unit scale with proxy file to make sure everything works fine!!