I have the same radios and using the Radioodity software, i was able to program additional nearby repeaters in the DIY area (up to channel 30). Those frequencies are fixed. But after that, you should be able to change the RX frequency. Separately, I also added monitor frequencies above channel 100 to keep them separated. Then, you can set the scan Y/N to skip the channels without any programming.
What are you trying to do? Program repeaters in the DIY area on a channel other than the "fixed" ones?