If you would like to add a specific type of minion you can use the following commands from the debug menu.
add

100 - Worker
101 - Marksman
102 - Valet
103 - Technician
104 - Guard
105 - Biochemist
106 - Scientist
107 - Spin Doctor
108 - Mercenary
109 - Diplomat
110 - Playboy
111 - Martial Artist
112 - Quantum Phys.

Example: add 5 102
This will add five Valets. Be sure that the mouse cursor is on some type of land, as they will be summoned to where the mouse is. I find it best to summon them right in front of the depot.