[svandamme]

Dear GDSID,
last week, i was cruising down the highway at a leisurely 45mph,
when i accidentally mis-shifted from 4th to 5th, i wanted to be in 3rd, the idea being to give my engine a bit of workout, but revving up to 4000 rpm.
For obvious reasons, it scared the be-jezus out of me as the car started to accelerate.
Luckely i managed to contain the situation, and got it into Neutral, applied full brakes before i reached 49.

Please tell me how i can avoid such a dangerous event.
Is there a way to remove 5th gear completely from the shifter pattern?
Can i just jam a piece of wood in there, or should i have the 5th gear physically removed from the gear box by a mechanic??