not to my knowledge. there are units in war at Sea that units can split their main gunnery, but u cant stack units to get more attack dice. all units roll independently
Just be aware they are optional, and not what I’d call generally accepted. Bit as long as you know who you are playing against and they are cool with it then you are fine.
Is it just me or does it bother anybody else that the Expanded Rules cover is not stapled to the actual book? And on the back cover they included Greece as an ally but not Hungary as an Axis. Also the sign for Poland is not the same as that of the one on the Stat Card. Its the little things that drive me nuts!