Need Advice

I have searched the internet to no avail and i was wondering if anyone had any info for me.

Here goes...

What i am trying to do is setup my @TV for 2 libraries on one computer, Sync from one and Stream from the other. Now i know that i cannot open 2 seperate instances of iTunes on one computer(which makes sense since it would make doing this sooooo much simpler) BUT i was wondering if there is any hacks or software out there that would just let me setup a stream hookup for my @TV from a library file, or any kind of workaround for this.

on the flip side i am actually more than willing to just switch between the two libraries on itunes, unfortunately this disconnects the @TV link each time i do it for both libraries, as a result i have to reconnect/setup the @TV each time i do this....very annoying after a while.

As a long time user of apple products i understand that what i want to do just may not be possible without getting a second computer but i really want to avoid having to do this.

Any advice i could get would be great, thank you very much.