I wish I could just plug a microUSB cable into my Gl.iNet router, and have a COM port show up on my PC. It would make getting to the bootloader & linux console so much easier. If you were to hook up the handshaking signals to some GPIO, even better.
Have you considered designing in an FTDI USB-to-serial IC?
If not that, doing something similar to the PoE support, and lining up some pads for D+/D- from the microUSB connector with the existing TX/RX/Vcc/Gnd pads? I did look into soldering to the microUSB pins myself, but they’re pretty small and access is blocked by the vertical USB-A socket on the AR150.
Yes, I know it would add cost, but for the convenience of not having to crack the case and wire up an external board, it’d totally be worth it. Plus it would make ‘tinkering’ so much easier for people who don’t already have such things lying around at home.
Given your support for makers (which is awesome!) I hope you’ll consider this.