in order to have any kind of tether working on wifi, the only way I found is using android-wifi-tether and use a fixed IP on the client PC, because DHCP doesn't seem to work. I had the same problem with the original ROM, but an external firmware was available which solved the problem entirely. Tried, of course, but doesn't seem to work. And the included froyo hotspot app doesn't work entirely.
Has someone found a cleanes solution?