If your camera app supports it, then you can go to photos + camera under application settings and select your default camera app. Alternatively, you could use the camera lens feature or simply pin the tile to the start screen.
Re: Wifi and download problems on my Lumia 640
Yep, I do. And that was the idea behind this uservoice. :(
https://windowsphone.uservoice.com/forums/101801-feature-suggestions/suggestions/7152370-background-downloading-in-win-for-phones-10
The store app is an exception.
Better stick with your 720. WPers are known for their patience. :P
If not, then I'd recommend the 5S. And this is coming from a hardcore WP fan. :(
The 930 has been the worst WP flagship till date from Nokia/Microsoft.
Re: Wifi and download problems on my Lumia 640
The second one is due to WP not supporting true multitasking. It suspends tasks when you're not using them (switching to another app, locking, etc.)
For WiFi, delete your Wifi networks from the phone memory and log in again. That seems to work on...
Ehhhh... I'm kinda disappointed with this. The previous flagships (1520,1020, 920) were groundbreaking in terms of hardware. This is just a high end meh phone.
Re: You can now reserve your copy of windows 10 for PC!
I think preorders have come a long way from being a solution to limited stocks. And not in a good way.