How add a configuration paramenter to an issue tracker plugin?

I'm re-implementing the tfs issue tracker integration plugin http://tfsteamcity.codeplex.com/, now using tfs java sdk.

I will add a feature to allow referencing an issue from the commit comment or using the change set work item associated info. It is exactly the configuration parameter that I need to add, to switch the way of search the work items ids.

Is it possible add a configuration parameter to the jsp page and store it?

Thanks in advance,

Alexander.