It depends on what XXX is. Some things we would love to support but we haven't yet had time to implement them (offers of help are welcome; as of 2013 there are only two active developers and we both have day jobs, so work often proceeds more slowly than we would like!) Some things, on the other hand, we have specifically decided not to support, because it goes against the overall design plan for the software. An example of the former would be support for searching in dependency graphs. An example of the latter would be collocation statistics in CQP (which has been requested, but which we decline to implement because we feel this is a feature better implemented by higher-level interfaces, such as CQPweb).