Hi Alex,
Thank you for pointing this out, I completely reverted a change (which added the nofollow to mentions/hashtags) by accident. I have added it back in so that these are correctly controlled by the option now too (version 1.4.10).
The account name is slightly more difficult. I originally thought that as you could display other accounts (through Re-Tweets) I should leave this under control of the option. However, I realise their are better options:
1) Only nofollow retweets if the option is set.
2) Never nofollow accounts.
3) Either of these, with an added rel=”me” option too, to let search engines know its an account associated with the website.
Which do you think is ideal?