You could get something like this to check and fill the spare without having to drop it down: Wheel Masters Spare Tire Inflation Kit - Under Chassis Mount - Stainless Steel Wheel Masters Tire Inflation and Repair WM82286-S
Edit - just noticed this thread was raised from the dead, but maybe it...
I noticed this while checking out the Anytime Backup Camera website: Navigation Override
– Anytime Backup Camera
Looks like it's pretty new, not a lot of information on it yet.
I'm not sure if the seat backs can be swapped, best bet would probably be to find a wrecked limited in a junkyard and get the seat covers from it to try.
As for the handle lights, check out this thread...
Since she got a Limited the spare will be a full size 20" alloy with TPMS. In the manual it's actually recommended to put the spare in the rotation for the Limited models.
I have a Salsa Mukluk that I love riding in the snow and mud.
2nd Chance - thanks for all of the details, your 4Runner looks great! I just got a new limited in grey/redwood and I'm excited to do some of the modifications in your build thread.