Space Separator Draw Line/Rectangle/Pick Line Keyboard Shortcuts

[Mac001]

Hello,
I have been looking for the Space Separator Draw Rectangle (and Line, Pick Line) command in the user interface keyboard shortcuts, but couldn't find them. I tried setting the Line:Rectangle to RE, but that didn't work in the Space Separator contextual tab. Does anyone know if it is possible to set keyboard shortcuts for these commands? And if so, what command do I set the shortcut to?
Thank you

[CADastrophe]

Using Revit MEP 2012, I am able to assign a keyboard shortcut to "Space Separator". You cannot rig it to automatically start off drawing a rectangle, though. What version are you running?

[Mac001]

I have a shortcut setup for Space Separator. I am using Revit MEP 2012, and I was looking for shortcuts to quickly change between Draw Line, Rectange, and Pick Line as I am tracing rooms. After you mentioned the version, I looked in Revit MEP 2013 and found it. The commands are Default:Line, Default:Rectangle, and Default:Pick Lines in 2013. It doesn't look like these are available in 2012.