The title says it all.
It would be like we do with tax rate manipulation, set to 0% to train more.
Imagine I just attacked a big Kahuna and got hand on 8million of each res.
Imagine I would like to burn them in troop training immediatelly.
If I have 10k pop at resource production I would like to be able to set it to 0 and put everybody at training.
It is even more important to all those noobs who suddenly realize that they made a mistake at upgrading so many resource plants.
I hope you friends from Kabam don't turn it into a buy product like: "One off Pop Adjust: 35 rubis"...