Some of the wing root lights are for runway turn off, and are only available on the ground, (RWY EXIT LTS ON/OFF)
Other wing root lights can be used in-flight for wing inspection / ice detection (WING LTS ON/OFF).
The wing mounted lights are for either landing or taxi as selected (high / low beam), (LANDING / TAXI LTS ON)
Some 146 (all RJs) had auto lift spoiler at touchdown – as described above; this option doesn’t require the spoiler lever to be moved, but the SOP requires selection after touchdown as a back up.