Keep in mind that these largely protect the operator and the power supply. Note that the USB input is additionally protected from reverse power, it is a good idea to replicate both of these protection schemes in your set up. The 5V net shows ups at the right of the schematic What is referring to is a ressetable fuse that is used to protect from short circuit. Taking a look at the schematics we can see the GPIO pins are attached directly to 5V net However, the simplest solution is to make a cable from your power supply or connector of choice to micro-usb, because you may as well re-use the circuit they have there. In my opinion, modifying the board (replacing usb header) is riskier and more error-prone than using an external supply with adequate protection. When under USB power, this net is supplied by USB power, but there is no reason you couldn't power it yourself, however, replicating some of the protection scheme is worthwhile to protect power supplies and prevent fires. This pin is directly connected to the 5V net, meaning indeed it is possible to power through that pin.
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