Do people here have interest for more campaigns to the game?
Technically the campaigns wouldn't be much different: you'd simply have to spread & conquer until you reach a certain spot on the map to complete a mission. Thus the strength of a campaign would simply be a collection of maps that could involve custom scripted sea missions. Also, I think the game limits the campaign for Romans only.
Of existing campaigns, there are FANpaign and 2NDpaign. The main language is German so they're quite unplayable for English speakers. I think one of these two is also available in English, but the translation was pretty bad if I recall correctly.
If it isn't clear at this point I still have a good knowledge level on how to modify the game, I simply want to see how much interest there is out there – new stuff is new stuff :)

New stuff? Hell yeah!
I can speak a little German, so I think I could play it even without translation.

I would love to see more campaigns for S2. Or perhaps just the german ones translated to english?

Translation would be doable, although as I don't speak German it would be very slow task for me to do it. The other thing I can do is to extract the text so that it can be edited in an easy format (XML).