Canon G1X Image Stabilisation Issues - HELP REQUIRED PLEASE!!!!!!

Hi, I've owned the above camera for about two weeks now having used mostly DSLR.s.

Is there anyway you can switch Image Stabilisation on in other modes apart from 'Auto'?

I use Manual mode a great deal but because I am unable to switch IS on my pics come out with a blur due to shaky hands?

Your help would be very much appreciated.