Hi. I recently got a new bike the BPM Imports f-15rs. Like the bike so far but the thumb throttle seems to only be on or off. There’s no gradual throttle control and makes it hard to use smoothly. Tricky to use especially when I’m on the beach. Does anyone know if there’s a way to change this or perhaps get a different throttle controller? The bike has a bafang 1000w hub motor.