I'm using CWR 2.6.0.1, which I think still supports AMEND, and it's working fine flashing the CM7 nightlies.
Version 3.0.0.5 of CWR is only required on a few handsets (not sure why) but you can use the older version on the Evo with no problem.
CM7 Nightlies - CyanogenMod Forum
Version 3.0.0.5 of CWR is only required on a few handsets (not sure why) but you can use the older version on the Evo with no problem.
CM7 Nightlies - CyanogenMod Forum