One feature I would love to see is a quick button for simply removing the comment author url, while leaving the rest of the comment intact. Honestly, this is the most common task that I use this plugin for.
I'm sure I'm not the only one who gets a lot of "manual semi-spam", where somebody has left a relevant comment on a post, but with a linkback to a spammy, or at least non-blog site, that you'd rather not link to. Currently you can either outright delete the comment, or you can click Edit, remove the URL, then re-save the comment.
A one-click unlink button would be awesome.