Hey thanks for the whitelister, it is the best I could find for DayZ so keep up the good work. 
I've made a little web interface for it, so new players can register and get whitelisted after they click on an activation link send via email. Works great so far if you want I could release it for other people to use!?
Anyway I had to setup my own database table because I don't have access to the source of your whitelister and needed a place to store temporary whitelist requests who are not activated yet (also with IP and registration date etc), so maybe you could change your table to add a field like "active" so admins can disable players in the whitelist, or like me players register with active=0 and after they click the activation link will be activated without any admin interaction, that should be safe enough for a whitelist I think.
If you want to see my whitelist registration in action take a look, your can test it but please don't spam me with 1000 requests if you don't like to play on my server, thanks.
http://brs.8bit.info/whitelist/
I've made a little web interface for it, so new players can register and get whitelisted after they click on an activation link send via email. Works great so far if you want I could release it for other people to use!?
Anyway I had to setup my own database table because I don't have access to the source of your whitelister and needed a place to store temporary whitelist requests who are not activated yet (also with IP and registration date etc), so maybe you could change your table to add a field like "active" so admins can disable players in the whitelist, or like me players register with active=0 and after they click the activation link will be activated without any admin interaction, that should be safe enough for a whitelist I think.
If you want to see my whitelist registration in action take a look, your can test it but please don't spam me with 1000 requests if you don't like to play on my server, thanks.