Set token expiration in firebase_auth

[Tom3652]

I need to grant access to my user according to some specific things locally so i am using the user.getIdTokenResult to get the custom claims that i have set from the Admin SDK in my Cloud Function.
My app works in airplane mode, but if i force the refresh token such as : user.getIdTokenResult(true), the user is logged out from my app and he can't use it in airplane mode because the method clears out the user.

I have never seen this behavior with the "automatic refresh" (not forcing it by passing true), so the user stays connected.
I need to get the latest value of the custom claims each time a user open the application without having to pass true to force the refresh manually and log the user out.

I think that being able to set a custom token expiration would help fixing the issue.