RTS Prototype - limit camera height/ select and move spawned AI

So, as the title suggests, the RTS Prototype tutorial works well enough to show some capabilities that can be extended. What i would like to do is to be able to take control of the spawned ai so that i can give it the same command to move as i do the boombot ie make it the control object when i mousedown on it. There is no problem with the sceneobject detection or collision, i just need to know how to change the control from the boombot to my newly spawned ai so that if i mousedown on the spawned ai he will move and if i mousedown on the boombot he will move, any pointers will be greatfully received :)

Also there doesn't seem to be anyway i can limit the camera height in overhead mode when using the mouse wheel to zoom in and out..any suggestions??

Thanks in advance for any help...