Expand WebServices to support Search / Lookup capability of a Jira Ticket from an outside system.

I am working with an SVN client vendor (Syncro) to add lookup capability to their product. Trying to have all the different filters pre created and calling the right one just isn't an option. It would be nice to be able to send the following criteria:

Project
Issue Type
Text Search
Issue Attribuites

A matching getSearchCriteraOptions web service would make sense too, so you don't have to look up the possible values for each of the search items above.

a new getIssueList that would include the dbKey, the project key, the issuekey, Summary description, Issue URL, AssignedTo would be great.

Syncro wants to store the Issue key JRA-6319 and the URL into specific SVN properties.

Here is some stuff Syncro already does:
http://www.syncrosvnclient.com/integration_bug_tracking.html
http://www.syncrosvnclient.com/demo/SVNBugtraq/svnBugtraq.html