I'd rather it sticks to doing what is asked, as otherwise sometimes it will group multiple actions together when only one is actually wanted. You can say 'open music' and then play it manually, or 'shuffle <playlist>' and then 'open music', or 'open music' then 'shuffle <playlist>.'
In iOS 7 music controls are in control centre, so they're only a swipe away, if that helps. It's at least a bit easier to get to those controls than the ones in the current multitasking bar.