[fysiks]

It is not possible to have a full server and have reserved slots (because no player can connect if the server is full and therefore you can't check of a 'new' player has a reserved slot). If you have an 11 slot server, you can change the "maxplayers" value to 10 and then it would look like its full with 10 players. However, this requires that anyone connecting when the server shows 10/10 to connect via console using the connect command.

With regards to having up all slots reserved for VIP players, I'd guess you'd need to customize the reservation plugin.