Patch to disable pets in a town?

[Helena]

Hello Hercules!

I was wondering if someone could help make or direct me to a patch that restricts pets in town(s). What I am referring to is about a similar option as conf/battle/pet.conf:

// Are pets disabled during Guild Wars?
// If set to yes, pets are automatically returned to egg when entering castles during WoE times
// and hatching is forbidden within as well.
pet_disable_in_gvg: yes

But only for specific town maps, Prontera for example.
 
Thank you so much! ^^