Modify a custom dim value through link tracking


I would like to send a custom dimension throught the link tracking.

I have a custom dimension “type” that can be internal or external, this custom dim is sent as “internal” when the page is viewed (by _paq.push(["trackPageView"]);)
but i want it to be sent as “external” when the hit is sent by the outgoing link (hit sent by _paq.push(["enableLinkTracking"]); )

Is it possible?