Is it possible?

Sure, it's possible, as long as they meet their guidelines, just submit the info. Don't have link handy, but not hard to find on imdb.com.

Sure it is. I wrote a short film for some company (produced). It's on IMDB. I wrote a feature (produced) for some other company. It's on IMDB. Everything I've written are all under different names, so no one name lists everything I've written together. I suppose one day I'll fix that. But then again, I've been saying that for five years...

the requirements are listed, I think the short or feature must have been shown at a festival plus some other requirements, I try to get everything I've done listed - it's becoming a quick way for people to check you out.

Don't expect it to be easy or quick - it's a slow process.