I really want tanks and planes, but if you add in tanks, make there be more than one type of tank, dont only slap a mark 4 on there, put the renault ft 17, for the french, and maybe even the A7V for the germans. also another tank that nobody has heard of before, but WAS used in ww1 was the Mark A "Whippet" Medium Tank. maybe you dont have to put all of these, but at least do the classic Mark 4/5 and a Renault ft 17.