I use the sim a lot but get so tired of having to enter and reenter the numbers all the time so would like to suggest:
1: That clicking the box brings up the number of that unit you have available in the current city and the you can raise or lower that total as required
2. That there be an option to SAVE a sim result that you like or want to work on later
As a tribal leader I try to encourage my people to use the sim but many tire of it early in its current structure
Cheers
Tzuzizu