A lot of the kits they have on board are Snap on tools and tools that were converted/modified for heaver use. Most of the kits are always on board in a emergency but after Columbia they now have to have a tile/blanket kit as well. The shuttle can go remote at any time as well as recover home mode in the event everyone on board dies. For being a 60's designed flying brick, it is loaded with avionics. The crew is along for the ride, they wont touch the controls to about 3 miles out on landing and that's because they were afraid to trust the auto landing mode which has never failed on all 4 systems. The biggest things in space is debris flying around, oxygen, water and radiation. All the on board medicine goes bad very quickly due to zero gravity and antibiotic loss and bone loss happens at a fast rate. So medicine becomes useless fast. I've been fortunate to say there was never an accident on my watch and hope there never will be.