Among the problems are: ADR malfunction, incorrect number of channels, it is not possible to deactivate the uplink and downlink dwell time, among others.
I will forward this proposal to the R&D team. However, implementing a new LoRaWAN region is not something simple and requires intensive testing before it can be released.
In the STM32CubeIDE development environment we already included the files and it worked perfectly with the RAK3172. But we would like to have the facilities that RUI3 provides.