I've got an idea lads.
Say you've gotten the basic techs at start. The only way to really advance aside from assigning researchers is to have your people aquaint themselves with different elements of advancement.
Yar..... you sent out yer peoples to work for ya. Then burden the basterds with elementary output execution. Let me tell ya humbly. You discover connection, say, bonded materials. You can then study the in reach and all to obvious paths of science. Like physics for example. On a beginning or primitive manner if you will. Might I be so bold as to invite a possibility of suggesting that the game might be a bee linning specified and tailorable application of execution. You may beeline through named science thus leaden up to branched specified advances. Every age brings about further uptunes to already existing advances in the cataogories of physics, biology, alchemy/chemistry, astronomy, geology/geography and philosophy/theory.
For example(construction may be improved upon with further research in physics and geology/geography. And the next named advances are reached at certain levels of knowledge in such feilds as the nation and common ones grow and flourish.)
Another idea lads is that yer wanna advance in metal worken, say iron worken, then yer citizens gatheren can advance in certain ways, as can yer iron workers with there craften and maken. and then yer consumers can learn lttile extras on there business matters with such fine materials yer workers are bringen and craften. Yar, thats one hit on the broadside if yer ask me.
Yar, tis goes like thes, yer first gonna come about advances by introduction. Then yer can teach it to the commons ones. When yer rollen and can build educational facilities. Yer can raise feild scientists and instructen ones. And further more, things may happen lads. As yer young minded ones grow, they may automatically implement national improving wheter it be builden, gatheren resources, fighten and dieyen, or teachen others. In turn lads, they may also object to your rule and spread unhappyness based on things yer not doein so well. Anyways, as I was sayen.
Heirgo you may further yer advances as you please as so research new little tricks as well. All in good time and at the same time ofcourse.