The Xede has a few safety features and a few that can be integrated. That said once you have a properly tuned car, those safety features should not be needed. The Xede does not loose it's maps so a backup fuel or timing map is not needed. If something is grossly out of range with the tuning, the stock ECU can still go into limp mode.
A "safety feature" for fueling is the wideband integration. While not completely finished, it is almost done. Basically, if the car stays in the "happy zone" of a nested map, then no modifications are made. If the wideband registers a lean spot in a rpm range, it will add fuel. The fuel addition is instant and once the wideband AFR has returned to normal the Xede stops adding fuel. The wideband would have to be a permanent install.
The Xede has a Boost solenoid output. It can control an electronic boost solenoid.
The Xede also has a Knock Sensor input. Thru a nested map, if knock is detected, it can retard additional timing. The MSM Xedes used to come with a knock buffer wired in the harness, and this is something we will be adding back in as well. It is not needed, but most people feel safer with it there.
The Xede also has two additional Analog Inputs and Outputs. With any input variable, along with an RPM variable, maps can be created to make adjustments for whatever you choose. For example, boost can be altered via a lean or rich condition, or any sensor temperatures. It is not always recommend, but it can be done.
It also has inputs for a shift light, an external LED, TPS control, and a Dual Map switch. Switching between maps can be done 'on the fly'.
The Xede is also OBD II compatible. Once the car is started and Xede has been activated, it is in complete control of timing, fuel, boost, and O2 sensor offsets. Since the stock ECU is still retained, cold start, OBD II, emissions, and low speed drive ability are just as Mazda intended.
Stephanie