I'd actually rather not have this addition. Despite your marketing this as a desktop > mobile transfer right now there's no reason your app can't be used for desktop > desktop sharing unless you add that random string.
I can see myself using this to move files quickly between a desktop and a laptop or vice versa by ignoring the QR code and just putting in the port.
Alternatively you could try the gfycat method by appending a few adjectives and a noun to create a readable but nonsensical phrase: https://gfycat.com/enlightenedpositiveasianporcupine
But IMHO If security on your own network is so intense that a random app opening temporarily on a random local port is a security concern then this app isn't for you.
