I just checked in support for this query. You can get the functionality by downloading the source code. It will be in the next release.
Here's an example of how you can use it:
var status =
(from tweet in twitterCtx.Status
where tweet.Type == StatusType.Retweeters &&
tweet.ID == "210591841312190464"
select tweet)
.SingleOrDefault();
status.Users.ForEach(
userID => Console.WriteLine("User ID: " + userID));