Fine Uploader S3 - Nowhere to safely call the asynchronous "setUploadSuccessParams()"

I've been digging into Fine Uploader S3 for 2 weeks now, overall this is a really good plugin.

However, I found one issue which I still haven't been able to overcome. I'm not sure if this is a plugin limitation or plain stupidity from my end.

I need to use this method. This is a method where I can set some custom parameters to shoot over to my server after a successful upload to Amazon S3:

var params = {
    file_storage: 's3',
    file_module: 'gallery',
    file_path: $gallery_upload.fineUploaderS3('getKey', id),
    file_name: name,
    file_type: $gallery_upload.fineUploader('getFile', id).type
};

$gallery_upload.fineUploader('setUploadSuccessParams', params, id);

There are 2 problems:

(1) This is asynchronous, and runs completely on a separate thread as the actual algorithm that fires out the "success" message.

(2) Depending on different places, the "getKey" method returns undefined. This is understandable, but I want the "one place" that getKey() will ALWAYS return that evil key I got from S3.

===========================================================

So ends up that I've got nowhere to place my snippet. I've tried a few places:

(A) Submitted callback

.on('submitted', function(event, id, name){

Nope. As expected, the getKey is not ready yet.

---

(B) "statusChange" callback @ newStatus == "upload successful".

.on('statusChange', function(event, id, oldStatus, newStatus){

This works sometimes, and sometimes not. Due to asynchronous issue. Also, quite hacky. Looks like this.

.on('statusChange', function(event, id, oldStatus, newStatus){
    console.log('Event: statusChange', oldStatus, newStatus);

    if( newStatus === 'upload successful' )
    {
        var params = {
            file_storage: 's3',
            file_module: 'gallery',
            file_path: $gallery_upload.fineUploaderS3('getKey', id),
            file_name: name,
            file_type: $gallery_upload.fineUploader('getFile', id).type
        };
    }

})

---

(C) Progress callback only @ "uploadedBytes == totalBytes"

.on('progress', function(event, id, name, uploadedBytes, totalBytes){

ONLY WHEN uploadedBytes == totalBytes. But again, this sounds dangerous due to the asyncrhonous thing. It's also quite hacky.

---

(D) Progress callback

.on('progress', function(event, id, name, uploadedBytes, totalBytes){

This seems to work the best, but, it sounds extremely hacky. It's spamming the setUploadSuccessParams() so it's really bad! I was wondering if there is a "correct way" to do this. For example, some bang-on event that works immediately.