This actually raises what is to me an interesting question. What to do when your work uses an open source module whose author is either not able or willing to make the modifications you would like, or disappears completely so cannot make any patches at all?
Here we have branched a couple of modules where the authors were unresponsive or dismissive of our changes. So now we use a custom version of MIME::Lite and Config::Inifile the former because Eryq doesnt answer mails and hasn't updated the module (despite posted bugfixes) in two years, and the latter because despite providing patches the authors decided they didn't want the functionality we needed. This means that for these modules we use our own distributions, which is annoying but better than doing a complete rewrite to utilize a supported module.
After conversations with a number of Open Source types lately Ive been seriously thinking about hijacking MIME::Lite until the author returns to Perldom. In fact we were contemplating a "CPAN Orphanage", perhaps a sourceforge project for all the CPAN modules whose authors have abandonded them.
So I guess the relevent point to you is that if you want a patched Logfile::Rotate and you cant get the author to integrate the change, then fork it and use your local copy anyway. If the author isn't maintaining the module anyway I dont see any reason not to.