It's been always a issue for us not being able to add any extra parameters to a URL when we use the page selector to create a link in a content block, for example.
It forces us to make ugly workarounds and I think that adding anchor tags to a URL or any other parameter is very, very useful.
There is a feature request from 2014, please vote if you feel it's important:
We have this same problem. It would be nice if there was a way to add additional parameters to the end of the URL for internal page links. Today we need to create an external link that and provide the additional parameters. This is a problem because external links are also absolute links (not relative), which becomes a problem when we clone our site back to our DEV or TEST environments.
Definitely upvoting this request. :-)