Hello Steve,
I tested this against a device here with a 5.3-36 enabler and set the StartupDelay dword to 30000(30 seconds). It delayed the enabler as expected. I would ensure you are setting the value with the correct casing so a capital S and D so StartupDelay. And also placed this into the Avalanche folder in the registry. If you are still having problems please let us know.
Regards,
Nick