It seems that since 3.0.5 the ebuild no longer creates a symbolic link /usr/bin/crontab to /usr/bin/fcrontab.
I'd say that's by design given the format is not really the same, to be honest.
Again, I'd say NOTABUG, since the two have different semantics anyway. Unless Wolfram feels otherwise I see nothing to change here.
I think the link should be set, because naturally there is only one cron daemon installed on a system. If I login to a system I expect a crontab command under /usr/bin/crontab whichever cron software is used. At least fcron is compatible with the usual cron syntax.
If the symlink is not there some tools like "back in time" do not work. if the format of crontab vs. fcrontab is not the same: are there any lines that vixie-cron understands but fcron not? If not it sould be save to allow other programms the access to fcron if they are expecting cron at least for adding new entries. maybe a useflag would be nice. i can set the symlink by hand, but i think there are a lot of people who like the symlink and its a more clean way since it is removed too if i remove fcron.
btw: http://www.gentoo.org/doc/en/cron-guide.xml tells the users about the symlink
Fixed in fcron-3.0.6-r2