I have sent some additional documents after sending my initial application to Singapore.( skype chat and phone record for 5 months, fido phone bill for 1 year, some more pics of different tour and wedding with explanation, fb msgs and fb pics which showing comments from familny and friends) I actually dont know whether it would delay our processing but i did it coz i want to avoid interview as well as i want to assist VO to judge our relationship which is more than genuine.
If u think ur additional documents will help to judge ur genuiness of relationship then its really worth sending those documents