I've logged eighteen hours into the pc version of this game, (still can't finish Hyper Hexagonist), and have just discovered that instead of moving your hand from the arrow keys to the space bar in order to reset the game (or tediously bringing a second hand into play), you can instead simply leave your middle finger rested comfortably on the up arrow key and use that instead! W also works for anybody using A and D instead, although the space bar is already more comfortably located under the thumb for such players.
Just wanted to share this just in case anybody else had missed it. The discovery certainly made me happy... It's the small things.