My feeling is that no power, and full up elevator
will give a low impact speed, with the only
possible exception being to enter failsafe
from low level inverted flight.
To further reduce the speed, add
a lot of drag by giving full ailerons to one
side and full rudder to the other side.
If you have each aileron on its own channel
make them both go full deflection either up or
down. If you have flaps use crow configuration.
On a combustion engine plane, you want the
engine stopped, even though an idling engine
makes more drag. You don't want it running when
it hits someone's leg.. On an electric, you want the
propeller wind-milling without power.
With these settings, your plane will come down
pretty quick with a minimum of collateral damage,
which could prevent lawsuits and field loss.
You could find yourself repairing planes more
frequently from momentary glitches, so if it is
possible, set the failsafe to kick in after a couple
of seconds of signal loss.
Jenny