Ian KD8CEC has released version 1.072 firmware. This includes support for both 20×4 and the standard 16×2 LCD screens (using i2c). It enables constructors to include or remove bits of code, and it allows the integration of an US$8 RTL-SDR to work on all HF bands to give full DSP, waterfall display, etc.
For more details see his website at www.hamskey.com
Download the manual (ug1072_087) for the KD8CEC v1.072, which has been updated by Rod KM6SN and his peer reviewers.