Looks like *plus/jrnl/apply can only be stopped while it is idle.
We're currently re-applying some journal files. As long as the apply program hasn't reached the end of the latest journal it is not looking for the apply.stop file. We use PxPlus V14.
We would like to have the apply program look for the stop file after 100 records or so. May be a parameter in jrnlapply.ini makes sense.