this page has points that seem to fit, without any caveats to suggest "unless the original work permit is non-renewable"
http://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=474&top=17
and to Alurra71, unfortunately my spouse's current permit expires before the 4 months, maybe a miracle will happen and CIC will get back to us and we won't have to worry about implied status, but if not, quitting the jobs would be a very sad result while waiting to hear from them... I still don't see in print on CIC documents that implied status forces my spouse to quit working though, not clearly spelled out, that is for sure