I'm picking up joonnes idea from the tweaks thread.

I think the multitasking screen as it is is a bit lacking. I would love to be able to switch between 3x3 and 2x2 like on the N9, but I could also imagine that it would be useful to have the first row of apps 2x1 and the rest in 3xX in unlimited multitasking. for example, if I take a picture of a phone number and need to peek into the pictures app to type it in dialer. or to have certain things easily readable and easier to see at a glance like weather, or to enable devs to make more use of cover view in general (e.g. better readability)

Also. I'd love to have a continuous scrolling multitasking view, so it only jumps from lock to multitasking and from multitasking to launcher, but scrolls freely within those screens.

Unfortunately, I have no idea how to do it myself...