In the next release you’ll be able just to click them as regular links: Recognize links in Markdown WYSIWYG editor - #8 by cgrunenberg
I can’t oversee what that would mean in terms of the underlying design of DT, but I can say that having a multi-select item (which would translate to a list) in custom meta data would enable a lot of interesting use cases. I’m suspecting though that metadata items which are basically lists are complex to implement, because e.g. you can’t just use simple search parameters like “contains” etc, so it would need different handling. But I think @cgrunenberg is the only one in a position to comment on that.