Are you asking whether the video processor could have an adjustable delay? Well, it could, but should it? It's a video processor after all...
The reason this is happening now is HDMI, which carries the audio and video. Typically the source only has one HDMI output so you cannot independently route video to the video processor and audio to the audio processor it must instead be sent through all parts of the chain.
Right now we use coax to avoid the problem but if we want the lossless codecs we will eventually have to deal with HDMI and the issue we are discussing.
Mark