Here's a plug-in that grants players a static amount of extra points whenever they capture a flag; similar to Apocalypse. The default behavior for self-captures is to deduct points from the player, but this can be disabled if you have a unique map that requires a self-capture.
All development for this plug-in occurs on GitHub, so be sure to follow development and new releases there; I will very rarely update this post with updates on new releases. The link below will always point to the latest stable release.
Plug-in Download (BZFS 2.4.14+)
[ GitHub | README | Download | MIT ]