If you look at Cake Wallet's implementation, then under nodes you can set a SOCKS5 proxy.
This would be beneficial to users in general, for example you can run a Tor instance on your device already, and just set Stack to use it instead of creating it's own instance, since running Tor outside of Stack Wallet allows you to customize it more. (such as setting bridges)
Then there's the question of whether the "Easy Crypto" mode would have an option to get routed through a proxy. (crypto to fiat prices check, etc)