Yes, flash it from recovery. I'm not familiar with that rom, or thunderbolt radios, but the developer should specify if it's it included, and if it requires a certain radio. If that's the radio you want, you can will flash it just like you would a rom. However, just make sure it won't mess with the rom you want to run. I'd flash the rom first, restart the phone, boot back into recovery and then flash the radio. Flash the radio first if it's a requirement for the rom you want to run. Be careful with radios, if you fuck it up, you will brick your phone. Remember to make backups before flashing.