Before making a purchase, I questioned the manufacturer's manager about the differences between this model and the GA 5030.
There was no clear response given to me, and no mention of a full-length button was made.
Pros
Those who are skilled with their hands will appreciate that the power is cut off as soon as the key is released.
Cons
Poorly placed ignition key. There is no key lock and no soft start. The key is broken beyond repair. At least I enquired at the service center about the availability of such push-to-start buttons, and they advised me to place an order with Hong Kong and wait.