A couple of ideas to hopefully improve the game play, please ignore anything which is currently in the plugin - I wasn't a VIP so don't know the full mechanics:
Make a sprite appear above the VIP players heads as at the minute it is quite difficult to see the VIP in a crowd of players.
Give the VIP a HP buff (200)
VIP needs to have a primary weapon
VIP gets a very minor speed boost over normal players?
Admins can set a VIP for the next round
If you are selected as the VIP then it must me made clear that you are, some people didn't realise they got selected.
VIP alive counter on the screen somewhere with the VIP player names on the same menu. (think surf overlay menus)