[ohiovr]

Wouldn't the rate of time reversal play a part in to the pressure exerted to the ground? If time were going at 1 second per second forwards we experience an acceleration of 9.8 meters per second per second, if we went 2 seconds per second would we experience an acceleration of 19.6 meters per second per second?

[jfengel]

You might, depending on what "rate" meant.

The reverse case is a simple matter of swapping the T coordinate, t->-t, for the whole universe. Making a local version of it, such that you're going "faster" than the rest of the universe, leaves a boundary condition whose properties are undefined.

[ohiovr]

For something sci fi how about a kind of gradient?