The action group menu lets you add all kinds of functionality to the buttons 0-9, to the 'abort' button (typically bound to Delete or Backspace), to the lights button, to the landing-gear button, etc.X increases build symmetry number, and shift-X decreases it - C and Shift-C quickly toggle angle snap.If a part has become turned and twisted in a way you don't want, hitting the Spacebar while you have it selected will return it to default orientation.Note: this will never go the direction you want it to go first time.

You can turn parts 90 degrees with QWEASD, and make precise adjustments with Shift-QWEASD: this turn the part 5 degrees, so press shift- 9 times to rotate the part 45 degrees in that direction.

Ctrl-Z can undo the last change you made to your craft, though be aware: it often undoes the 2 most recent changes.

Holding shift while moving the mouse wheel zooms you view in and out, rather than moving up and down.

Shift-clicking any part of the ship will select the entire ship for movement, while Alt-clicking copies that particular part and everything attached to it.

I've deleted a few that aren't true of the latest version and added a couple. I am always on the lookout for obscure features, and I found an excellent list online that can be used to start a list here. Kerbal Space Program is a great game, but it is poorly documented.

Ksp mac f5 f9