When typing obvservations in I sometimes find that suddenly time starts speeding forward in the sky view. I discovered that this occurs when the text field I was typing in is defocused (because of clicking on a control somewhere, etc) and I didn't notice my typed text was no longer going into the text field I had been typing in. If one of these lost keystrokes is a space, this triggers time to speed forward. Not useful when I am in the midst of a complicated observing session.
I really don't think this is generally a useful function to have attached to the space bar. Couldn't this be something less accidentally triggered, like maybe command-space bar? It happens to me at least once or twice in a four hour observing session. Its a pretty easy landmine to step.