1. Yes, my eyes also stopped on the down-locking reel, which makes sense (at least for me and my arms-casting style).
2. Accuracy - I am not good enough with a Spey Rod to comment wisely, but think I can offer the following for single hand rods. We can call it dampening and I think we can relate to speed-power, but I find I can achieve a more accurate cast with a smoother - slower rod,versus one to punch line out hard.
For years, I have lawn cast to mutliple targets (5wt and 7wts), and find, I can achieve greater accuracy with a relax cast (from 30' to 70'). Maybe because I think less about the cast, and more about the fishing, or maybe I have have to spend less effort in managing the shock.
With my 9wt RPLXi (Pike tool), I am using more arm, and notice a tendancy to roll the rod (thus slicing (sorry for the golf metaphor)).
(Continue with the golf). My father loved golf, as much as I do with fly-fishing. I grew up with a club in my hand, and was with my Dad a lot (too much, so when I came of age, I shun golf). There are similarities, but one lesson, that applies, from back stroke to front stroke, it is about the rythym of the transition.
I am not good enough in my spey cast to comment on what makes a rod more accurate, but for a single-handed rod, if is help me, to keep my stroke slower and the transitions clean, it would.
Oh yes, I found a relationship with the line selected to. My 8' 5wt Bamboo with a Courtland 444 DT, the rod is graceful, but use a RIO
Trout LT WF5 and it just does not work!