Ian Lee, KD8CEC has added further documentation on his website about his alternative firmware for the µBITx transceiver:
General features
http://www.hamskey.com/2018/02/cat-support-ubitx-firmware-cec-version.html
Memory Channels
http://www.hamskey.com/2018/02/using-memory-channels-in-ubitx-storing.html
Reducing CW Key errors
http://www.hamskey.com/2018/02/reducing-cw-key-errors-in-ubitx.html
You will also find additional resources on the website covering his AutoKey (built in software memory keyer), his uBITX Manager software and more.