Because of my dangling ext clients I decided to do a clean install with 0.14.3. I pasted in my old network name to create the same one as before and noticed that upper case is no long supported in the network name. Is that intentional?

Yes, we removed that to avoid some conflicts when we de-capitalize client side. Just easier to manage this way

Ah figures. Thank you

Is there no way to remove these old hanging clients?

you have to go into the database and delete the row from the table.