-Removal (or increase) of the throttle-only speed limiter to preferably 28-30. If it's possible/viable without a big investment. (up to $200 is doable if it has other benefits.)
The ca can't do that for you; that requires changing the controller (and probably display, as a sset to be sure they work together). (assuming your controller settingsd can't be changed)
If you're limited by the power and voltage the battery produces, you'll have to change that too.
-Better control of the throttle so it ramps more instead of feeling like on ON/OFF switch. (if possible)
That could be just how your controller works, in which case teh CA won't change anything becuase it uses the same throttle input to tell the controller what to do, so however the controlelr responds is how it responds.
it oculd be the throttle itself, having a very small rotation range for the whiole variation of output voltage of the throttle. that can be fixed with a better th rottle, or using hte ca, or both.
-I would like a LITTLE more torque, but I'm sure that would more than likely require a motor upgrade (currently 750w brushless hub motor)
Higher current controller will provide more torque...but that will have to come from the battery, which is probably only designed to handle the original current. So it may either shut off all battery power when more is demanded, or it may stress or damage the bms or cells, or blow a fuse if ti has one.
you'd have to see what hte battery is rated for, and try to only get a contyroller that has a limit below that or can be programmed to stay below that.
increasing speed generally means higher voltage, increasing torque means higher current, assuming no motor change.
changing the motor to do it means investigating what yours actually is / is capable of, and then finding a different motor that has the characteristics (kV / kT) that let it do the job without changing the other parts...but usually having a motor that makes more torque means one that spins slower, and vice-versa, assuming you stick with the same type of motor, so you may ahve to change other parts anyway.
And I don't really use the pedal assist unless I need the extra kick. It's a bit awkward to pedal and with only five gears I have to pedal quite fast over 20mph.
Do you mean that you aren't pedaling, just using the throttle?
If you are pedalling, even if you aren't able to put pressure on the pedals to provide human power, you're still triggerng th controller to run the motor, just as an on/off thing at full power of your assist level. That might be why the throttle feels like on/off.
The battery has an on/off switch but that definitely looks like more than 2 pins if I understood correctly.
How many wires from the cradle to the controller? Or if the contyroller is inside the cradle, now many wirse from the battery pins to it?