If Palpatine and Soontir are fighting Omega Leader can Palp be used to change a die that is on Soontir if Soontir is being targeted by Omega Leader? Technically it is Palp changing the die and not Soontir. Just needed some clarification.
Omega Leader vs Palpatine
The most current ruling is yes.
However, just to be clear, it was originally ruled that the Emperor could NOT do so, but has since been changed as the link above shows.
The answer is yes. There's a thread specifically about that in this exact forum with the response from Frank.