In STK, when pressing the accelerate key too soon, you get a penalty, and you get to look at other players starting the race while being unable to move.
I find this incredibly frustrating and useless, plus that is the very first thing a new player sees of STK: "no you can't move, because you pressed the accelerate key too soon, you bad boy." "Wut?? But I didn't know that thing!"
I am for removing this penalty.
Hiker argued that such a penalty also exists in MarioKart. I ran some tests with MarioKart Double Dash today, and yes, there is indeed a penalty, but it happens when you press the accelerate key during a long time up to the "Go" moment. If for example you pressed it a long time, released it, say 1 second before "Go", then press it on "Go" time, you get a boost (in MK the boost happens when we press it on "Go" time).
My other reason for wanting to remove that penalty is that I want players to be able to make noise with their engines before the race starts, with smoke and shaking karts. I think that's part of the fun in a racing game: getting the engine hot

So my proposal is just:
- no penalty
- get a boost when pressing at "Go" time
- be able to make noise before the race (but you need to press just on "Go" time to get a boost - keeping the accelerate button pressed all the time won't give you a boost).