1. Since you can't right click in roundcube we need a way to open links in e-mails in a new window or new tab. I could probably modify the code to do this myself, but there isn't enough time in the day, and I think it should be a standard feature in RC.
2. When you sort by sender, I've noticed that RC only sorts alphabetically the list of emails that are currently displayed (1-40 out of 300) and not (1-300 out of 300). I dont think that this is very useful unless you sort the whole inbox rather than the results on the page.