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It's not qDD issue, it's an operator error.
The attached photos (2 and 3) do not have a bad quality but are blurred by camera movement.
OS is for handheld photos, not for taking photos while camera is on tripod.

It is when you are few meters away.
Transfer speed depends on signal strength which depends on distance between devices.
Built-in wifi has weaker signal and transfer speeds will be lower. Also built-in wifi works in "b" standard, and MR3040 has "n" which is faster.

I am at version 3.5.3. When I tried to connect with my 5D Mark IV camera, I got the message "Found Canon EOS 5D Mark IV wireless camera, connecting". But cannot establish success connection. My 5D Mark IV firmware is 1.0.4. I am not sure whether the latest camera firmware causes the probl...

Go to app settings and turn on automatic preview.

Eos utility and LR use native windows USB driver, qDD uses WinUSB driver. You need to uninstall WinUSB driver to use camera with other apps. Windows 7 installs USB drivers only for one USB port so it is possible to use camera with qDD and LR with out uninstalling driver just by using different USB p...

Also - if you read camera manual you will see that there is no movie recording with built-in wifi on D5300

No, you cannot connect more than one device to a camera. It's a camera protocol limitation.
Also you cannot switch devices intantly. You have to disconnect one device and only then you can connect another one.

In theory it is possible but don't know if it will be practical.
EyeFi cards have own software on them which in case of any changes in files (like marking as protected) reports it back to the app on remote device.

ML is a modification of cameras firmware and can make camera incompatible with qDD.

I've updated the link to missing screenshot.
The (1) and (2) buttons and manual movement arrows are available only when camera is set to AF single mode (AF-S on Nikon).