you can edit the build.prop by
adb pull /system/build.prop c:\where\you\want\to\put\it\
open with wordpad and add the following lines
save the file
adb push c:\where\you\want\to\put\it\build.prop /system/
reboot so that the settings take effect
Stampere suggested this over in Paul's thread with no replys. The hxspa and gprsclass are not included in the Froyo build.prop anywhere I can see. They were included in CM 5.0.6.
Has anyone added these to Froyo and do they help or are they unnecessary and will conflict with the new Froyo 4.0.6 radio build?