ThreadID to a custom URL

[exidge]

Hello guys,
I've searched the whole forum and also the web, but could't find something useful for my problem.

I'm looking for a custom thread URL, when creating a new thread it should redirect me to some other URL I want. Just like the option in creating forums "(Entering a URL here will cause anyone clicking the forum link to be redirected to that URL)"

I thought about editing it in the database: the threadid number, but that won't work because it will only change the number and not the whole link.

Does somebody have a suggestion?

Cheers,
exidge