Calling in Artillery vs Reserve Move Order

I would agree, and would also add that if the opponent wishes to use the 'Reserve Move', he/she does so before the FFE is announced.  

Reasons for the single (not double) move:

Infantry will move very fast towards the closest cover, but probably not woods.
If no cover within 5", they will hit the dirt!

Vehicles because;
1) Driver panics,
2) Driver puts it in reverse by mistake,
3) Vehicle stalls, and/or
4) Vehicle does not want to go in 1st.

Paul

If I was running the game I'd have the units on the receiving end take the standard experience (as a reaction) test to see how many of them react in time to get away from the incoming fire rather than an 'all or nothing' house rule.

But that's just me