Can definitely reproduce, happens 50% of the time when I host LAN worlds. No crash reports.
I haven't experienced any similar crashes since, but I haven't been playing much vanilla singleplayer either, so I can't really tell.
Incomplete without a crash report.
I assume they just misspelled "found".
If you don't want to get notified, stop watching the issue.
There's a torch in the screenshot .
There is no "redstone button".
Mining fatigue slows down mining, but the breaking speed of redstone is instant, and you can't decrease X% from instant. So it might be intended, but I'm not sure.
Works as intended.
For suggestions go to http://www.reddit.com/r/minecraftsuggestions/
Can't confirm, mined 64 blocks with an unbreaking III diamond shovel, only lost 10 durability.
Using 1.8