well we all played ZK for a long time , you have to admit that not much of new unit being implemented or its too much to choose from now, so to make the game more interesting, why not give an option to disable one or two class unit
my suggestion is not that particular unit but that class of unit for all factory
example , assault , skirmish , scout. when scout disabled , no one can build the scout unit from all factories
with certain unit disabled , new strategy need to put in mind to make the game more interesting.
can be voted during game start but only applies to casual games. unless you guys want to ladder this