I think to round it out more we can do a PS that says: "Default Vault: [Preferred] [Last]" Where everyone's preferred is default to 1. Then players can change their preferred to something else too with a command. I'm going to try to get another deploy in here soon, with an update to the announcements to finally resolve the spam, and I think we can work this in too.
If I understand what you're saying, players by default will get /vault 1 when they type /vault. They can then set in their player settings to get the last-used vault page or any other page of their vault by default. If so that sounds great and perfect! The only other thing quite a few players asked for was a shortcut (/vault l, /vault p, /vault last, /vault previous) as an alternative way to go to the last-used vault page. If you agree, I think it makes sense to make all the changes at once while the hood is open.