minimum target size for mouse

The feeling of the the mobile task force is that our touch size SC should
include a minimum size for a pointer/mouse target in addition to touch. We're
not sure what that minimum should be, whether it should be the same 44px as
the touch or smaller. It was the end of the call so were were not able to
flesh this out sufficiently... Os I'm creating a discussion here. If there
is momentum I'll set up a WIKI page. There is some discussion about how
would the author know the what is activating the control on responsive
sites that share icons for touch AND pointer. The current wording is.
2.5.4 Target Size: A touch target
<https://w3c.github.io/Mobile-A11y-Extension/#def-touch-target> is at least
44px by 44px of the visible display at the default viewport size. (Level AA)
What about this amendment, If it's an ok construct, then what value should
be for the pointer minimum size.
2.5.4 Target Size: A touch target
<https://w3c.github.io/Mobile-A11y-Extension/#def-touch-target> is at least
44px by 44px and the pointer/mouse target is at least <x pixels> by <y
pixels> of the visible display at the default viewport size. (Level AA)