Some sort of a G-meter...
Include a simple small number somewhere on the screen that displays the current acceleration that the command-module is experiencing. + or - in front if the acceleration is going "down" towards the floor of the module or up. Maybe have the number be green for a number between 0-5g, orange for 6-10 and a red number for anything over that. Have it then flash red for something that might end up being fatal. While there wouldn't be any problems resulting from over-g's it would give players the ability to be more realistic with their throttle use and plan their re-entry more carefully.
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