I would like the ability to filter twitter feeds more effectively using tags. For instance, if I subscribe to some company's twitter account, I might not want to see retweets or replies in my feed, so if BQ could automatically add tags such as "twitterrt" and "twitterreply" to relevant feed items, they could be easily filtered out.

I don't care about hashtags on twitter, but it seems like a natural extension of my suggestion to have BQ add hashtags in a tweet as actual tags.