Platform: WIN 8.1 Spring Update

Using a local (domain) account to login to Windows

Using a MS Live account just for the purpose of installing Store apps

The first time you go to install a store app you are prompted for your Live account credentials. Once entered, the only choice is SAVE or CANCEL. Once SAVE is chosen Windows remembers the password and the user is not prompted next time they go to install a store app.

I want the user to be prompted every time. It seems earlier version of WIN8 allowed this. Can it still be done? I looked for a registry hack to prevent the Live password from being memorized but could find none.