Okay...
I just noticed this thread is in the developers' subforum, and I'm certain I only put it in the Kindle forum so that could be why I'm a bit out of my depth. (I know better than to go asking developers if a battery was sound.)
I'm assuming the thing you're calling KT3 is the thing I think of as the K8; and 'T' = touch.
I'll have a play with things to use as a stylus.
I won't need to block anything since I did buy the without-ads device.
The only problem with wifi is that I'm in a rural area so it's appallingly slow, and that's nothing to do with the kindle or any other hardware.
I imagine mine is already running 5.8.5 (presumably the latest all-singing all-dancing s/w?) since it's brand new...
Last night I did a bit of book-moving and got my head around the way the books aren't on the device itself, but can still be moved and put into collections. I like this, since they download pretty quickly when wanted, and Archived Items on the Keyboard was not useful because it ended up with so many items in it.
I am finding the new screen trickier in low light, because the grey on the e-paper is darker than before (comparing side by side) and text is also smaller which counters the improved font. But it's useable. I only had to give up on the titles on some book covers, but seeing the image isn't that important so when I have a choice I'm sticking with list view (which I imagine uses less memory too).
Of more concern, I'm seeing ghosting already. Right from the first. I didn't expect that. In your opinion is it worth having them change it for another?