For me Gallery has no configurable permissions.
Pressing the three vertical dots on the top right corner and then pressing All permissions it show about 15 permissions but I can't set/unset them.
What clearing cache and data and then force stop it?
Judging from the changelog (check it on the official forum) IMO you can happily skip this upgrade.
I was on the mood of doing so, but I could not resist and I upgraded.
Apparently no changes...
Yes, it's possible, but I bet it will never happen.
I mean on MIUI.
There should be some ported ROM for RN2 using Android 6.0, but my previous experience with ported ROM is the is always something not working.
IMO 2 hours for a 3000mAh battery is still good.
For what % did you start?
As far as I can remember it took me ~1h30m from 10% to 100%.
And how about heating?
No one told that it doesn't work.
Someone told that it's a little bit slower, like they changed something in the SW side to charge slowly, hopefully to prevent or reduce overheating.
Since the upgrade I always did a slooooow charge using PC USB.
When I can I prefer to use this method to create less stress on battery because it gets really hot and I use QC3.0 charger only when I need to charge it while at work.
When it will happen again I'll report.
Anyway if they did...