Is there a way to toggle the "request-password"-flag in the trezor without reinitializing it?
As no-password results in the same wallet as an empy password it would be nice to be able to switch between the settings (without having to generate a new seed).
What makes you think that the "no password" is the same wallet as an "empty password"? I doubt it is true. If you switched that flag, you would probably loose access to your "no password" account. Just reinitialize the device with the passphrase enabled.
1. It makes sense because the wallet is based on seed + password (probably put through some hashing functions).
2. I tried it