Personally, I would not reach through a window to control throttles. Too many chances for things to go wrong. One slip and things go from bad to exponentially worse. Like bumping the wrong throttle due to confusion over left/right orientation, or over-correcting, or sudden movement causing you to lose footing... and then there's a boat under power without anyone at the controls.
There are options out there to add wireless controls. Though if you're wandering into that price territory I'd think adding thruster(s) would likewise be a good choice. Might be overkill for a 32 though.
Depends on the docking scenario, but when there's enough room I've used a line off the bow with a bowline loop. Drop that line over a cleat as you're coming in and then use that to gently power the stern over.
The trick is having a plan already in your head if you miss that cleat. Which is true for any docking situation. For me the most valuable learning experience was coming to understand when the boat was going to get into situations I couldn't easily get out of. As in, too far over to allow enough room for a turning. Knowing that helps determine when you're better off stopping the effort and trying again.
That and getting a feel for just how much power is really necessary to maintain good control. Slow doesn't help you if the winds or currents start pushing you around. Our old boat was like that, it would wander too much if I tried having it just 'in gear'. I had to give it a bit more throttle. Then it'd find a more stable course (powerboat, with little keel). I likewise had to learn just how much distance and amount of reverse I'd have to use to pull it to a stop. Once I figured that out docking was a LOT less stressful.
Yet to fail docking single-handed being equipped with mid-hull (close to pilothouse doors) docking lines.
