If you're talking to a producer as a writer/director, be careful about mentioning that you're an actor because the first thing they'll be concerned about is that you want to connect yourself to the project and it will be a deal breaker.
If you are talking to someone about partnering on an independent film that you've written, want to direct, and have a small acting role in, it would be advantages to mention that you edit because so many projects fall apart in post.
The bottom line is, you have to assess the circumstances and the relationship with the person, before revealing all of your hats.
Whatever you do, make sure you have separate marketing materials. Any business card that has all of those slashes can make someone think that you do a little of everything but don't have fabulous talent in one area.
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