Short a shorted link

I need to have more short link with different custom URLS for the same long URL, since is not possible to short a long URL more than once, I would like to use a short link to create a second short custom URL

I have an installation like “www.domain.com/folder” where this is possible, in a second installation “www.domain2.com” if I try to short an already shorted link I have an error message.

Is there any workaround to let the second installation works as the first one?

Thanks,
Andrea

It is possible to shorten a single long URL more than once. Explained in the readme, see http://yourls.org/#Config;site