Android create custom IM type

In my android application I want to create a custom type 开发者_Go百科of IM that should be editable via standard contacts editing application. There are several built-it IMs that user can select from: Aim, Windows Live, Yahoo, etc. I want to add "My Very Best IM" to the list, so that user can pick it quickly without the need to enter the "custom" text and value by hand. Any ideas on how to do this?

---

You cannot add this functionality to the inbuilt contacts app.

In other words, you cannot tell that this app should show up in that list.