I think it would be really nice to have more options than just kick, ban, and chat on the remote admin. Here are a few things I would like to see:
1. Remove and List Bans: Its a pain that I have to shutdown and restart the server just to remove a ban. This would be so much easier and less of a hassle
2. List other people logged in as Administrator: This would also be good. I like to know who is also connected as a Admin
3. Change Server Name: This isnt really something I care about, but it would be nice
4. Set/Unset Server Password: I would definetly like to lock and unlock a server to switch between private an public play without restarting!
I probably got more suggestings, but I cant remember. But these are really ones I think alot of admins will benefit from!