Here is the only workaround I can thing of:
Use a scriptable launcher to insert the line-break character as text. I recommend Butler, but there are others.
You can assign a keyboard shortcut, and you're set. The good thing is that this works in many other cocoa apps. The bad thing is that it enters a paragraph break in Carbon apps. But the Carbon apps already have a shortcut for this. Just like all Cocoa apps besides OmniGraffle :-p
Use a scriptable launcher to insert the line-break character as text. I recommend Butler, but there are others.
You can assign a keyboard shortcut, and you're set. The good thing is that this works in many other cocoa apps. The bad thing is that it enters a paragraph break in Carbon apps. But the Carbon apps already have a shortcut for this. Just like all Cocoa apps besides OmniGraffle :-p
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