After installing the plug-in and doing some work with it, I experience odd editor behaviour: the key binding for Undo (Cmd-Z) and the DEL key stop working. Since uninstalling the plug-in makes this behaviour disappear I believe it's triggered by (i.e. not necessarily caused by) it.
I cannot reproduce the problem, on my Mac I have many Eclipses with the plug-in installed and none is affected, both Cmd-Z and DEL function properly.