Context: Following a recent inconvenience I've had, where my headphone's mic stopped working (but otherwise worked fine), I wanted to make a second account so I could use my phone as a mic - but still use my PC client to listen. Unfortunately Discord only allows one account per email - which shot down that plan pretty quick.
My suggestion: Allow a secondary account/"clone" account to be activated on a single email address. [Whether activated by Discord team (upon request), or simply an option given to users - I don't mind which.]
Example: 'JoeRandom' connected to server (via PC, output), 'JoeRandom2' connected to same server (via phone, input).