This is a request I made back in v2.3 and had hopes it would be in v3.0. Not only make it easier to know what you are looking at, but also when you add a ban filter, it should default to the view you are on (ie, email tab, should default to email filter when you add something). I've also remade the request a couple of months ago in this specific forum (I'll try to find the topic in a few minutes).
Would also be nice to allow regular expressions for ban filters. That way you could ban a wide number of emails (or ranges of IP's) in a single swoop, which in itself would cut down on overhead. Then you could do a ban like ".*@(gmail|yahoo|aim|hotmail)\.(com|net|org|biz|info)(\.(au|uk))?" and ban those four services as well as potential scammers and clones and alternate addresses, all with one line. Of course, that's just a simple example of the power of what you could do, but it should make the point.
Would also be nice to have a "reason" area, where you can list the reason for the ban, so if you ban a specific IP/email address because it belongs to a specific person, you can remember why.
You could always use an SQL query to wipe the entire ban list clean, or just to wipe the email list clean.
Edit:
Found my topic in regards to the separate tabs...