Are you okay with me sending a pull request to make a slight change to the way duplicates are handled? I'm using CruiseControl.NET in a slightly different way to the convention and rather than patching each update it would be much easier if I could make a slight code change that will benefit the community that also makes sense to offer as an option.

In IntegrationQueue.cs there is a swtich that handles duplicates, and I'd like to change the switch so that there is another option:
QueueDuplicateHandlingMode.AddAdditional

This will allow people to force multiple builds as opposed to one, which in my scenario makes sense.

If you are okay with me making this change I'll create a pull request?

By adding a new handling mode the original functionality is retained but an additional option is provided so that I can use CruiseControl.NET in a more useful way.