It wouldnt hurt to ask, infact its even better if they can supply C# or VB.net version of the SDK with all the bugs ironed out.
There are a few things that doesnt work such as the PTY and no DLS. I tried D.Radio.exe (found on another site) and that doesnt support any of that either, it is very basic. I think the SDK supplied by realtek is incomplete and its up to you to expand it. Its very unstable on my pc as well.