As for the use on a iOS device.

Depending on what you would like to do using MOI on a tablet.
you might be interested in an extended desktop app from splashtop called xdisplay (splash top extended desktop2)
It enables you to use your iPad as a second monitor for your laptop or desktop computer.
The cool thing is that it also allows you to use the iPads touchscreen to control whatever you are running on your computer.
So you can also control MOI!
So if you are only looking for a way to draw lines with your hand and you already have an iPad you might get what you want for less then 5€!

I have tried it and it works fine.
Just for orbiting in 3d I recommend just using your mouse.
It works using the inscreen orbit and zoom buttons, but it didn't feel that good when orbiting.
Maybe if you change some of the control options in moi, it might work better. Don't know.
You can download a free version wich works for 5min at a time.
You do have to install a programram called splashtop streamer on your computer to setup the connection.
And both devices need to be connected to the same wifi network of course.

I have no idea how it works together when you are using a Bluetooth stylus or something.
But I think it won't make a difference.

Hope it helps
And if not for this, you might just like it to extend your desktop. :)
It even streams your computers audio!