[Tracker] tracker-needle/tracker-search questions

[Peter Reilly <peter_reilly wycliffe org>]

Is there a way to change the limit in tracker-needle like you can in 
tracker-search?

Is there a way to specify the application type in tracker-needle like 
you can in tracker-search (example: documents via -t)?

In either tracker-search or tracker-needle is there a way to limit the 
search scope to a specific file extension, or path?  (I'm not asking how 
to limit the indexing scope).

Thanks!