I’m not sure why there isn’t a builtin way to do this. When a process eats all memory on OS X, it starts “pausing” applications. Upon killing the offending app, one wants to un-pause all the apps. But if you close the dialog, you can’t resume!
I can “resume” like this:
which appears to make the apps usable again but the processes still show up as “paused” in the force quit dialog. Also, I think the unpausing should respect the process tree (not process names.)