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You can "shotgun" connections but hardwired and wifi usually isn't a win since the wifi will be more error prone and higher latency than the wired. So if you have both you should probably just do the wired.

Like I said, for embedded systems. The wired connection is not an active link to the internet.

My laptop can use both connection at the same time. Maybe you need a better OS.

You should read up on how routing works. In particular - source-based routing.

It may just be my laptop, but I was able to get both WiFi and Ethernet working on an HP Elitebook 8460p after toggling a setting in the BIOS.