There is some early work for redirection in the current version of Howl (notifications from many Twitter clients will show a "Related Apps" section when viewing the notification where you can launch an app if it's available). The next step is to make that available from the push screen, which is yet to be implemented.
The two features I would like to complete before pushing out an update are turning off the badge count, and allowing navigation from one notification to the next on the iPhone version of the app. The first feature is well on its way and the second still needs some work.
I don't have an timeframe yet, but wanted to let you know that I'm working an upcoming release as time permits.
Thanks for writing!
Jon
Howl Developer
j...@howlapp.com