Will it stream to a PC like a car player with displayserver

I'm sure it could if someone wrote the software for it. The Rio Receiver protocols are well documented. And I get the feeling that Displayserver could be run on it with very little change, as it uses an almost identical architecture.

What remote are you going to use will it be the same as the car

It has its own VCR-style remote with a unique codeset.

Out of intrest does it use the same caching as the car player not that it would be needed.

It has much of the same code. However, when it it streaming and playing audio, its disk stays spun up.