The xorg.conf for EPIA motherboards changes a lot depending on which
driver, etc. This one is actually for use with the Open Chrome ...
The .conf file you are quoting unfortunately refers to Open Chrome driver, that is developed for Xorg.
AFAIK Pluto is tied to Xfree86 and in general with vanilla Debian, so I'm afraid that at the moment those conf are useless for any Pluto user.
I don't have either that much familiarity with linux, but I guess the proper and more consistent way to have good video support for EPIA based box would be to move to Xorg.
One of my early experiment has been to install from scratch a Debian Sarge on my EPIA box, replacing Xfree86 with Xorg and compiled some drivers against a Xorg tree (no Pluto installed, just plain Debian). The result with Xine was amazing, smooth video with low CPU usage, working like a charm. So things CAN be better than actually are, at least for EPIA video support.
The point is that I don't have any idea on how many things would break in Pluto because of this change and how difficult it would be to make them working again.
As I've placed several times question like this on this forum but so far I didn't get any reply, I'm starting to think that this may be a very tough task that is beyond the actual scope of work of Pluto developers.
Nevertheless It would be interesting to have just an opinion about it ...
A different (and possibly unsuccessful) approach would be to try to compile openchrome drivers against Xorg and use them with Xfree86, but again I don't know how possible (or silly) would be this.