I don't think this is what was asked. In the Run Configurations and Debug Configurations dialogs, the first tab (called "Main" for a java app launch or "Test" for a junit launch) has an item at the bottom that reads "Using XXX Launcher... Select Other" where "Select Other" is a link that pops up a list of available launchers - not JREs. There doesn't appear to be anything like this in the Coverage Configurations dialog.
I too am experiencing the same annoyance as was reported in this thread. I just installed EclEmma today, and I used it for several hours without the problem, after the initial eclipse restart following installation. But now every time I try to launch with coverage, VisualVM is popping up, which is very annoying.
I'd love to know if there's a way, short of uninstalling VisualVM, to get this to stop.
Andy