[FW] Tracked 4WD Lifter: Aegis

[R9000]

Alrighty, so I got around to starting on my electronics today (waiting for armour and other bits to arrive before I can start on the body). One thing I've learned is that EC3 connectors are the bane of my existence, it took me a good two hours to figure them out and get a few of them soldered. Before I start modifying TZ85s into brushed variants, I decided to test my third TZ85 (which will stay brushless) with my Turnigy Helidrive SK3 Motor. It works great on the throttle slot. However, it only spins one way. I've tried connecting it to other receiver slots, and the receiver refuses to start and just beeps if I don't hold the stick down at 0.
So this is a problem: I need to get my motor to be stationary when the stick is in the middle, turn one way when it's at the bottom, and the other when it's at the top. I think this is an ESC issue, having poked around on various RC forums to try and get the transmitter to tell the receiver to run backwards. Now I'm sure it'll be fine on the brushed modified TZ85s given that they've been set up especially for this situation, but what do I do with this one? Do I look for some other brushless ESC whose zero point is at 50% throttle? Or is there some way to modify a brushless TZ85 to run forwards and backwards?

Anyway, here's a quick vid of me testing the SK3, sadly with no sound because I forgot to unmute my mic. :/ Next time I'll remember. :P