[Koha] How to change HTML / TMPL path prefix?

How do I change the path prefix where Koha looks for HTML / TMPL? We're implementing Koha at Simon Fraser University for three small student operated libraries (about 4k holdings each). We host Koha at http://some.host/koha/opac-html/opac-tmpl/... (not live yet) but the Koha CGIs appear hard-coded to look for HTML / TMPL at http://some.host/opac-tmpl/... I dug around in the code a bit, searching for how to change the path prefix to match our setup, but no luck so far. Can anyone on this list help? Incidentally, we're also very interested in the Debian packaging efforts. Are current versions of the debs available online anywhere? What are the current obstacles to getting these packages in the official repositories? Thanks! Jack