Such a tech as seeker suggests should be very expensive. Assuming for example that there were two levels of it, it would effectively allow me to double the output of one of my barracks.

However, because there are already techs for increasing troop production rates (of the 2 selected types), I am not in favor of this tech being added. Most players stick their barracks on production of one troop type anyway (whatever is the most valuable troop in that barracks - HC, Mace, Marks, Ballis, whatever). So all this tech would really amount to would be a super extra master training.