It's now possible on develop and see in action here: https://try.gogs.io/gogs/gogs

It works so far but there is on minor annoyance.

You have to enable the wiki even if you use the external address. Which does not make much sense IMHO

If you do not enable, the tab is not even visible. Same rule apply for issues.

Yes but the difference is when you use an external wiki url you cannot use gogs internal wiki. But when you enable the issues you can use gogs internal issue tool even if you have added the external issue url.

@stonerl make sense, let me think...

My suggestion would be. When Using the internal Wiki one cannot use the external-wiki-url. When using the internal issue tracker one cannot use the external issue-tracker-url.

I think one will run into problems with the issues-tracker-linking when the external and the internal-numbers are the same.

@stonerl yes, I think it would be better to rise another issue. And this should be closed.