PVE server with RB - PVP Radius possible extend ?

Hi guys,
 ive got RB in a pve server and enable PVP in the small radius set by default on them, just about 0.25 that see through area we can see walking in the rb and server display messages " you have entered rb pvp enable ( etc ) ".
Question if someone is familiar on how do i extend that radius ? i wanted to have a bigger area so people can counter but also give them a chance for a better fight with raiders and so likewise.. not sure if i need an additional plugin to have that enable ? anyone knows bcs i couldnt find in the config file, only the map radius 0.25 increase the map only. thanks 

adding for clarification, i mean extending the Dome its created on the events for larger PVP Enable area 

you can extend that radius by changing Protection Radius in the profiles. you can try increasing it, but most maps will be incapable of supporting it, unless you use custom spawn points on large islands or flat areas

Thanks a lot @nivex , i did notice that specific radius but cant rememebr if i tried or not changing that radius. i will do when i have a chance but regardless this is very good work with the plugin. i was running the free version but i am very happy and will purchase the full version now. best