Sorting threads by revision

[Cyberuben]

Hey,

I'm trying to sort my threads by a certain thread field, which is a field holding a current version.

I want my threads to sort / filter by this threadfield because I don't want my threads to get ordered because someone's posting in a certain thread.

I want my threads to be ordered like this:

r004
r003
r002
r001

So, sort by changelog_revision, descending.
Can someone explain me how I can do this?
and if possible, could this be an increment variable that increases each time we post a new thread?