Oh! And for the timing thing on the tasks - what comes to mind for me is the type of mechanic used in Lonely Mountains: Snow Riders for example. You have to go down a mountain and get a target time in order to unlock the next section of the mountain and there are around 5 stages. It keeps a track of all your stage times and lets you know where you're faster or slower, but so long as you hit the overall target you're good. Just a thought that came to me.