It would be a very nice addition to be able to hold the space bar down and navigate around the workspace. Something similar to Illustrator’s Hand Tool.
I’m really enjoying Easel. I use it in conjunction with with Adobe Illustrator to get just about everything I need. Been at it for more than a year.
I often find myself zooming in close and moving around the X/Y plane to place paths exactly where I need them.
I don’t think there is any other use for the space bar right now, and most users that have any background in design will see is as second nature.
Also, I know there are shortcut keys for scrolling the workspace up and down, and zooming in, but its a pain to go find the scroll bars and leave the path I’m working on as often as I do.