No, you need DDL to get multichannel sound via S/PDIF when gaming. DDL is DD that's encoded on-the-fly when playing games, so you're basically asking if there's a way to convert audio to DD without converting said audio to DD.
Its been a while since Ive used it, but as I recall Windows will 'see' your DDL sound card as an analog multichannel device, and the device will encode the audio to DDL and output it via S/PDIF. This means when watching movies, etc the pure DD/DTS track will be decoded to PCM, send to your sound card where it is then re-encoded to DD, and then decoded again in your receiver. This subjects it to needless lossy compression.
I think you should be able to set the config in whatever media player you are using to use your Digital Out on your PC, and use the DDL device as your Primary Audio Device for gaming. This way when a media player plays a file with a DD/DTS track it will be output directly to your receiver.