a) Remove the unmetering capability it altogether (which would be a shame)
b) Unmeter ALL steam content even if not served from your server (presumably very expensive, not even sure if it would be possible)
c) Just be really clear right upfront on ALL your communications and adverts (not just within the FAQs) about Steam that there is a strong possibility that the content downloaded will NOT be unmetered and that neither you nor the customer can control it.
Don't expect people to look at FAQs, small print, or notes for details since this is a fundamental limitation of the offer.
Instead, state it right upfront in the same place you talk about unmetering. It makes the 'message' weaker, but it also makes it accurate.
The banner said nothing about any FAQs at all, and other places simply ask you to read an FAQ but don?t state the issue upfront
This page doesn't mention the risk upfront http://games.orcon.net.nz/index.php?page=steam it just says to read an FAQ.
This page doesn?t mention the risk upfront http://www.orcon.net.nz/support/gfaq_page/which_sites_are_included_in_the_o_zone/ it just says to please read a note.