WPMU Domain Mapping and Redirects

Ok, so somewhat of a more advanced question here – I currently have a multisite network with domain mapping installed, so each site will have a custom TLD mapped to it.

I want to add universal redirects, so can control the redirects of ALL sites in one place, so I could just write a rule like this –

/shortlink1 --> /long-domain-link/

And each domain would function like this:

domain1.com/shortlink1  --> domain1.com/long-domain-link/

domain2.com/shortlink1 -->domain2.com/long-domain-link/

Is there a way to do that, so I could easily edit all redirects in a single place? I’m guessing it has something to do with .htaccess?