[Imp]

Been a while but use the opfire filter, set range for infantry & ATG/ATGM to whatever you want, if need be set armour max to say 1.

Now use the Y key to set range against air units if you want.

Note AAA units which have SAMs & guns the Y key only effects the guns range.
The SAM still operates as normal including against off map opponents if its capable.

One of the few units I fiddle with if facing helicopters, the opfire filter (key0) is very powerful & worth using for ambush situations to. Paid version only.