Meow coupons (camping) already have the offset, editing just isn't implemented already. Also, the value is encrypted so until an algorithm is found, you will manually have to get the encrypted value for an amount of meow coupons/ bells (bells use same algorithm).The point of open source projects is the strong impromvent through community. A nice example is PKHeX.
I can't told you for sure, that I can deliver a new major feature, because I'm new to 3ds hacking and need to take an overview over the project.
But I think there is a lot of place for improvment. I would like to found out more about individual item flags (Flag 1 & 2), what can be done with exhibition.dat, editing camping coupons and camping ground.