netman, really great work, and I do apologize for not being more well-informed. This makes complete sense in both respects...
I probably didn't reboot after the 3/6 update and just got pissed off too quickly when it improved only slightly, and I just put it back in the box. (I do adore this hardware now, with several exceptions I may post elsewhere, but I was pretty thrown by the fact that the second slider since 2012 was seriously flawed, so I had little patience at the time).
And yes, if the keyboard matrix and firmware isn't arranged properly for more than 2 key presses in hardwar