Update service (//US) does not change DependsOn

When installing a service, I can set dependency on other services using the --DependsOn parameter. But when a try to add this dependency using //US directive, nothing happens.

I know we don't use the latest version of procrun but I checked source codes and if I don't misread it, the //US directive still does not chage DependsOn parameter of the service.

Is that a purspose? If not, can this be repaired?