You are correct that version 2.5.1 does not support Motorolla MOTO ROKR E8, but you can definitely try installing it on to your phone and test.
As a very similar phone E6 is supported most likely it will work on your phone and is worth a try.
For information on V3 please check
http://telefusion.in.
One more thing you might have problem downloading from the .JAD file as you phone is not supported in 2.5.x, you can also try using the jar file directly.