Sorry guys. On a simple audio system you may not be able to detect a difference, but on mine, there is a major difference between different FLAC codecs and even versions of the same codec.
While FLAC is an open standard, the quality of the coder and the style of coding can and do make an audible difference. Just because you may not be able to hear it on your system does not mean it is not there. It is.
So, the question is this, "Is it possible to have JRiver use the native codecs on a PC vs. the ones built-in to the software?" Simple as that.