Does Hahlo allow me to use the Twitter 'track' feature?

'Tracking' is a feature that isn't currently available via the API. Twitter have said that it will be added in the future, but not until they are satisfied that its ready, which is a good thing.

However, as an alternative, you can use the new search function in Hahlo to search for your 'tracked' keyword (or any word) and you'll get a timeline of tweets, very similiar to what the 'track' feature would return to you in you IM.