I used (13) kmtest files from bootcdregtest-74451.iso.
kmtest_ [create|delete] works on main 'Kmtest' (driver) service itself:
I assume it is the same for [start|stop].
The sub-test (driver) services get created (when run), then stay there (as is):
*Automatically delete sub-services: may not be wanted.
*Let 'delete' accept a parameter to delete a specific service: may not be needed.
*(By default,) Let 'delete' apply to all created services: should be enough.
Virtual PC 2004 SP1 (5.3.582.27) + bootcdregtest-74451.iso : same issue.