[solo]

Rather than use Shift-I to obtain commander and unit numbers, it's easier to just enclose their names within quotation marks, just as Gandalf has done for magic items.

For example:

#commander 356
#unit 10 369

is equivalent to:

#commander "onyx priestess"
#unit 10 "nightmare"

Either creates an Onyx Priestess commanding 10 Nightmares.

Edit: Thanks for the correction. I've changed it here, too.