hey dude. i dont know the answer but i have some ideas. am i right if i assume that you want to move the sprite around like a circle and you want the second finger to be the center? like a dividers?
at first i would try using the MultiTouch Plugin.
http (colon) //www.scirra.com/forum/plugin-multi-touch_topic49525.html
secondly i would try to create a "limited revolute joint" on "second touch".
you can ad limited revolute joints to your sprites if they have physics behaviour.
i have no idea if this is going to work and how this is going to work but i hope i could help you a little bit.