Full ban ability - critical, although I think this should be on the understanding we only ban members where all three of us agree it is necessary (bad memories of PK banning the likes of Kalinokos for what appeared to be no good reason). Spammers are of course a different kettle of fish.
IP Ban - not sure, you certainly need it and it might be a good thing for the rest of us to have, but we rarely see the same IP address twice.
Avatars/Signatures - can’t remember a recent case (stevey maybe?) but the nature of the site is such that someone might come up with a gravely offensive signature/avatar. Banning them and deleting all their posts seems a bit of a blunt instrument.
Banning spammers - it’s a really long way around at the moment. You have to ban them, typing in “spam” twice, and then go and delete their posts. What would be really, really useful would be a “spammer” button which bans them and deletes all their posts in one or two clicks.
War room - I’d quite like to be able to merge posts/delete threads in the war room. The “log IPs” thread is just crying out for all the posts to be merged together, and all the “so and so has been banned as a spammer” posts crowd out the real threads and make finding them a nightmare so are also crying out for deletion.