It's extremely cool of them to integrate some mods into vanilla. Vein miner, wall lamp and underground/hidden conduits were must-haves for me and so many others.
Death-on-downed chance now applies to several non damage health state changes. (Heatstroke, hypothermia, tox gas, lung rot) - can't use hotbox to guarantee loads of prisoners anymore.
Things to load into transport pods can now be changed at any time. - modify pod contents mid-load!
Loudspeakers and lightballs can now be switched on and off. - no more uninstalling to save power.