It is handy having a zoom setting for the Timeline, as it allows for better placement of objects, transitions and so on. It might also be handy to have some form of "vertical zoom" for audio tracks. Now that the envelope is editable, there's very little screen space with which to place a point on the envelope line (as per Std Height). Even if one could set the height of those tracks to double (as per Double Height), it would be a lot easier to precisely place points.
Perhaps a toogle button somewhere to do that?