You can disable the ecobee4 sensor and only use the remote sensors for temperature and occupancy readings. To do this, tap MENU > SENSORS. Remove the ecobee as a participating sensor in all of your comfort settings. You can also do so on the Web Portal by selecting the Sensors tile, and removing ecobee as a participating sensor in all of your comfort settings. Your ecobee4 will operate based only on the active sensors for the selected comfort settings.
Note: you can only remove ecobee4 as a participating sensor if you have at least one remote sensor participating in the particular comfort setting you are trying to adjust, otherwise you will not be able to make these changes.