If you have no BT or RF engines in any of the address's in 2-29 it is not a problem. You can use the address for anything. Those address's just have extra value.
That is correct. There are some challenges with setting a stall voltage on those addresses if need be for older Pullmor motors since the "SET" button clears out the information stored in the Base3 but Lionel posted a work around they are effectively available to all types of engines.
Just FYI from the Power and Control site...
TMCC Engine Disclaimer
Since IDs 2 through 29 are potentially Legacy, TMCC, RF, or Bluetooth, clearing engine information (name/number) can give slightly different results than with IDs 30 and up.
If the ID is set as Legacy, then the entry is not cleared with SET, as RF or BLE are not controlled as Legacy locos.
If the ID is set as non-Legacy (I.E. TMCC); AND the RF or BLE switch is in RUN; then the entry is CLEARED and the loco is UNPAIRED.
A TMCC engine’s name/number is lost if you press “SET” when setting the ID. Just enter the relevant info once you set the loco ID.
Lastly, older PULMOR equipped TMCC engines used “SET” to set the stall speed step in the loco. In this case, the “SET” will erase the name/number. The only fix for this is to move the TMCC ID out of the 2-29 range OR re-enter the info once you set the TMCC ID and set the STALL.