Is there some convenient way to build a playlist while browsing music?
>From the player interface, the standard way of creating a playlist

seems to be to browse around and hit the "+" button to add to the "Now
Playing" playlist. The downsides to this are that one wrong button
press can wipe out all your work (hitting play for example), and that
you cannot preview songs before deciding to add them.

Seems like you want to be able to browse around like normal, and have
a button which adds to a *separate* playlist. Does this exist?

I see the "add to favorites" but it doesn't look like it's intended
for this given the favorites are stored in the prefs file. There's
also the "zapped songs" playlist, but that seems to only come into
play from "Now Playing", is that right?