Yay, another Vantha character! Welcome to Mizahar and Avanthal. You're definitely allowed to give your ideas or critique anything someone else comes up with.
As for the World Development forum, If no one beats me to it, I'm planning to open two threads there: one to discuss adding more information on Vantha Holds to the wiki and another for ideas on Avanthal locations. I don't like just posting placeholders, which is why I haven't done it already. So, if anyone has good ideas and wants to make a thread in WD, please go ahead!