Spending more and more time inside a spacesuit
Spacesuits are a mini spaceship and astronauts have spent up to 9 hours inside them! They can drink from a tube, refill their PLSS, but I don't think they can eat food.
It would be great if they could comfortably spend more than 12 hours inside it ! Or even go to sleep (standing) but it might be stretching it too far.
What they'd be able to do inside their spacesuit could help reducing the transporter (lander) weight!