Q Bombs the machine in v1.0. Exits the game in v1.1. Both of these functions are about equally useless. S Turns slow motion on or off. If you have a slow computer you don't need this.
T Pops up a window which displays graphics and sounds from the game.
Use the left and right arrow keys to page through the entries. If you come to a blank entry, keep going. V Asks you how many extra VBLs you want. High values seem to make the game sluggish and not much else. W Warps to any level.