That’s an interesting feature, perhaps we might be able to implement it somehow.
As for the more general situation regarding footnotes, I have written at length on it here:
Normally you can simply write the sutta ID and it will create a link to the main SC. This is broken at the moment, however, but will be fixed in due course.
Getting links between discussions on D&D is more tricky, due to the limitations of the underlying search, which uses a database (PostgreSQL) rather than a fully-featured search engine. But we’ll see.