[Plugin: WP-Sentinel] Bad need of whitelist – breaks communication with PayPal

This plugin is GREAT! But with a whitelist it would be PERFECT!
A whitelist for Ip-adresses and domains. I am using it on several sites, but on e-commerce sites it breaks the communication with online payment solutions. With strict settings it also locks you out when hitting the WP “log out” button. And it has to be run with the strictets of settings, at least on my sites.

Is this in the making (I see others mising that option), or can anyone tell me how to mod the plug in to make one?

http://wordpress.org/extend/plugins/wp-sentinel/