I'm not sure if this is even possible, but I know it's on some of the newer Sony DSLR's and it has proved very useful. Even if it's not a huge improvement some stabilization would help.
Not going to happen. You're much better off using a stabilized lens or stabilizing in post anyway. If stabilizing in post remember to use a higher shutter speed to avoid funky motion blur effects.
Also, if I remember correctly, Sony DSLRs use a "sensor-shift" to do stabilization which is a physical mechanism built-in the camera and thus impossible to do with Canon DSLRs.
The ARM cpu will probably die if we try something like this ;D
Buy an IS lens?
I'm not familiar with how Magic Lantern gets it powers but maybe if it is possible to access the sensor cleaning mechanism and some sort of fuzzy math then poof! I know it's a fantasy but it would be great to use with vintage lenses 8)
That mechanism just wobbles a piece of plastic over the sensor.