I may be the last Hero owner that does not have sprint vvm working. I tried several of the known work arounds with no success. If there is anyone running this rom and cannot get it to work, extract the "voicemail.apk" from the gapps package (link below) and install it with root explorer. Works like a champ for me.
Google Voice FTW I got SVM working and still went back to GVM. I dunno', SVM seems so...yesterday. lulz