Change difficulty setting in-game?

Hi guys, I want to know is it possible to change the difficulty setting (normal->insane or reverse) in game?

One way I tried is making a custom harvest ability which doubles the resource income, but the peasants act strange after I added the ability to them, they no longer have build-animation while building a structure(the resource income works fine), same as acolytes, no harvesting-animation.... This is sad, and, besides, I think the differences of normal and insane comp activities are a lot more than resource income. (attack wave, the way they build, MF, micro....). so Is there anyway to work around this? (through AI editor, trigger...?)

Any help would be great appreciated!