Were you still looking for an answer to this question? RIM has released the update for the Mac Eclipse v 1.1.2 Plugin. You have to go to "Help > Install New Software ..." and type the url: http://www.blackberry.com/go/eclipseUpdate/3.5/java . It should come up with options for the BlackBerry Java Plug-in Category. Clicking the arrow will reveal the other OS component packs (4.5 - 6.0). Install these (will take a while).
After this, go to the folder where your Eclipse plugins are located. You'll see the folders for the component packs (e.g. "net.rim.ejde.componentpack"). Copy the net.../components/bin folder from the 6.0 component pack to the other versions' components folder (backup the old one first).
In the components folder, there will be a BlackBerry.ee file. Copy the one from the 6.0 component pack into the other versions' components folder (again, backup the original). Open the new .ee file in a WYSIWYG text editor and change the version information to be accurate to the current component pack's version (e.g. 6.0.0.29 changes to 5.0.0.25).
In Eclipse, you need to add a system library. Open the Preferences and go to the Java > Installed JREs menu and click "Add...". When the window pops up, click "BlackBerry Execution Environment VM." For definition file, this is the BlackBerry.ee file for the version of the JRE you are adding. Name the JRE appropriately (e.g. BlackBerry 5.0). Next, click "Add External JARs..." and navigate to the net.../components/lib folder. Select the net_rim_api.jar file. Click finish and you should be good to go. (Repeat for other versions as necessary).
All that's left to do is to specify the correct JRE in your project properties (Java Compiler > {Click} Installed JREs link). Then, make sure the correct version is selected. Also, make sure there is only one JRE listed in the Project Explorer (newbie lesson learned).
Hope that helps if you still needed it to.
I should also add that I'm running my simulators on Windows via Parallels.