It may not have been changed for 7 years, or even supported now, but it works great
Re: -f doesn't work on 0.6 beta
Maybe that's what you meant it to say, but that isn't what it implies.
The way the wording is written of the "usage" message, is that the -f option will force to ignore that. The message is open to misinterpretation, which is never a good idea for help messages ;-)