HTC Eris :: Drop Down USB Tether

I rooted this week, and my first two roms were alyousis (probably wrong spelling) and Evil Eris, both of which had wired tether built into the OS, and it would appear as an option in the usb selection screen. I was having problems with EE, so I went to the the rooted stock version of 2.1, which is very stable and is running well. I'm having problems with the wired tether in my current rom (I can't remember the dev who makes the stock ROM, I think it's ECLIPS3), but this ROM also doesn't have the dropdown tether option. In EE, tether worked pefectly with my mac and once I installed the drivers it worked perfectly on my XP thinkpad. In the stock ROM, it's the complete opposite. My mac doesn't recognize the eris as a new NIC and nor does XP or 7. Is there a better, more compatible version of wired tether for my ROM, and is there a way to get the same drop-down options that was in EE? Also, is there a fix for the 50% bug present in the eris official ROM?