I have few suggestions to devs for next builds:
1. Add a working MIUI camera app(ANXcam) or optimized GCAM for this device.
2. Add an option to remove until xx.xx time for battery on quick settings menu
3. There could be some optimization about quick settings generally, some texts are behaving weird in some languages.
4. Add an FM radio app, yes it's not used much but it can come in handy for some situations.
5. With the latest A13 build, no longer can connect some enterprise wifi networks properly. I tested with college wifi which is authenticated with TTLS-PAP, it's buggy. I mean after the first connection it can't connect afterwards. I have to change the certificate setting to trust on first use every single time after disconnect. But it's inconvenient.
6. Fix the "charging rapidly" text showing even if normal non-fast capable charger used. This was the problem in older builds and still exists.
7. Separate the charging led light and low battery led light setting.
8. If adaptive brightness setting configured to set brightness once when screen is turned on, when someone's calling screen becomes pitch black if the phone was in pocket. It shouldn't change brightness if screen is woke by a call, in my opinion at least.
9. Status bar icons seems buggy. Whenever new notifications recieved, the icons slide to right from clock. It looks weird after some time.