would like to see a "marriage box" in the source linker area.
also a "parents box" to link to parents of individual
Adding these sources is quite straightforward as things stand. As described by the original poster (back in 2015!), if the focus person is the groom it should be quite easy to attach his father / parents at the same time. Switch the focus person to the bride to attach to her and her father / parents.
(I specify "father" as my experience is that usually only the father is named in the sources of this type that I encounter.)