The additional tags just aren't necessary and should be symlinked.
I have mixed feelings about these merges.
freebsd-ports provides some useful information -- often ports will relocate configuration files to conform with FreeBSD's standard filesystem hierarchy. That being said it's more important to know what software we're talking about than the fact that it was installed from a port rather than built by hand.
The version tags are a mixed bag: There are some practical changes across major version numbers, but I don't really know that it's significant enough to warrant a tag per version the way we do with Windows.