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I created a mono project that might work to call sublime with the proper file and line number.  It works on windows, but my mac is busted right now (and the money for a new mac-mini went to the Unity 4 license upgrade).   https://github.com/rstehwien/UnityExternalScriptEditorHelper 

I also have a package for running monodevelop builds in unity  https://github.com/rstehwien/Sublime-MonoDevelop  

This thread discusses this a bit (and someone posted a blog entry that consolidates some info) http://forum.unity3d.com/threads/128352-Using-Unity-with-Sublime-Text-2-(How-to-get-everything-set-up)