The current Twitter feature is a bit poor for what would be expected from a "normal" tweet. Most site (or plugins) allow to set a "via @XXXX" and Hashtags ( #XXX).
Would be great if there would be new fields where we could set the twitter account and hashtags. Would be perfect if hashtags could be personalized for each category too (for example, and in my case, I would have #mobilephotography in general and specifically for Gallery Categories, like Macro, a specific hashtag like #macro). Hashtags are one of the most important things on twitter.